Title: I Rely On You
Pairing: Jung (U-Know) YunHo/Kim (Xiah) JunSu
Disclaimer: Not my boys.
Why HoSu is OTP
Xiah JunSu of TVXQ
Real name: Xiah JunSu
Birthdate: Real - December 15, 1986 // Legal - January 1, 1987
Personality + Other Things: JunSu is easily the "cutest" member of DBSK. Originally, he was going to be the charismatic member and the youngest ChangMin the cutest but, with his round cheeks and sweet smile, it wasn't long before he won the hearts of fans as the cute one. JunSu is recognized as the moodmaker of the group, cheering up members when they are down; even when his jokes are bad, they're funny. He has a pure heart and is a hardworking, going through six years of training before finally making his debut. Within DBSK, he had the longest training period, faced with many difficulties of puberty as his voice refused to change, finally did changed but would not cooperate, and finally cooperated to bring him up to the level SM required of him. But his perseverance and dedication have brought him to where he is, known as one of the best singers and dancer in the Korean pop industry.
U-Know YunHo of TVXQ
Real name: Jung YunHo
Birthdate: February 6, 1986
Personality + Other Things: YunHo is the leader of DBSK, though he has the cutest personality. From Jeolla province, he is considered a bona-fide country boy, occasionally slipping into his region's dialect when excited. He is known to be clumsy and forgetful, but a strong and charismatic person at the same time. His bandmates respect him as a leader and remark frequently on his manliness. He is also known for his work ethic and dedication, which have given him high marks in almost everything he does. He was second in his high school class, and placed third in his rank in a world wide hapkido competition. He was also the only member in his group who maintained an all-salad diet for one month during the summer of 2008, to get into shape for their new album's concept. YunHo is recognized as the dancer of DBSK, though he has on occasion pointed out JunSu as his favorite dancer. He had the second longest career in his group as a trainee in SM, with four years before his debut.
This pairing is likely to be the first pairing I'll name if asked for something sweet. They are so adorable, it's a little sickening. Except not really. Their fondness for each other, YunHo's gentleness with JunSu, is what really drew me in. But I'll explain how I think they work.
JunSu has this childlike innocence to him that makes him appear a little vulnerable. (YunHo has commented on how JunSu's neck is a "dangerous" feature, because it makes him want to protect him.) YunHo, on the other hand, is the older brother to a younger sister and the only son, so he understands responsibility and how to take care of someone else. His image is on the polar end of JunSu's. But the more you pay attention to them, the more you can see that JunSu, in little ways, takes care of YunHo, too. (Ex. JunSu wrapping arms around YunHo from behind during a perf where he was overexerting himself and aggravating a back injury.) Their dynamic is one that kind of flows to match each other's shifting moods, and as much as I see YunHo being there to protect JunSu, I can see JunSu being the support YunHo needs every now and then.
They've known each other for so long (at least a year or so longer than anyone else in TVXQ), that I think they've become really comfortable around each other. Sometimes, you can catch their bodies turning towards each other, and JunSu tends to hide behind YunHo when he's getting picked on. In a video where YunHo is waking JunSu up, he rubs at his cheek to stir him in such a natural way, it's as if he's done it all his life.
I thought it might be too much to post all the videos I've got of them as embedded videos, so... Here are just the fanvids, for a sneak peek into their dynamics. Following that will be links out.
My favorite one.
BONUS! Couple Talk, where they discuss how they work.
HoSu in Prague
HoSu fancam - backstage moments - JunSu playing with YunHo's hair? YunHo pointing out something
HoSu fancam - various backstage moments - Rising Sun perf and other promo - YunHo gets possessive
HoSu fancam - behind the scenes - sports gear commercial shooting
HoSu fancam - Hug during Super Triple Concert - play fighting
HoSu fancam - during '05 MKMF - holding hands
HoSu fancam - Hug during Dream Concert - YunHo stalks JunSu
HoSu fancam - at the airport - holding hands
HoSu fancam - backstage moments during Mirotic promo
HoSu fancam - YunHo sings to JunSu</a>
HoSu on DBSK variety show
HoSu in Paris
YunHo wakes up JunSu
YunHo asks JunSu if he likes him
JunSu gives YunHo a back massage
YunHo wishes JunSu a happy birthday
YunHo is tender
YunHo tries to sabotage JunSu on Happy Together
HoSu fancam - JunSu jabbers, YunHo patiently holds his hand
HoSu fancam - Hug - O Encore Concert Tour - YunHo overexerts himself, JunSu steps in
HoSu balloons making
HoSu balloons making 2
HoSu announce their love
YunHo claims JunSu in the elevator :9
YunHo pokes JunSu's cheeks
HoSu haptic cf
HoSu dance battle
HoSu dance battle 2
HoSu dance on XMan
HoSu dance on XMan 2
JunSu interrupts YunHo
YunHo pranks JunSu hard 
HoSu with kids
HoSu at Premium Mini Live - behind the scenes
HoSu making eyes at each other during making of Only Love MV
YunHo welcomes JunSu back
HoSu fancam YunHo watches JunSu embarrass himself
YunHo and JunSu roll around
HoSu fancam JunSu crashes YunHo's Spokesman rehearsal
HoSu fancam YunHo calls out for JunSu
HoSu fancam Mirotic concert buttsmack
Too big to be posted whole...
DBSK House Tour caps
In fan interpretations;
The Sixth of Five Senses by onew
Interim by scribete Actually a YooSu, but how she writes about HoSu's relationship (even as platonic) is love
And Just Go by angelacaducca
Sleepless by firelights
Contact, Confirmation by unlearned ***** FAVORITE *****
Step by Step by mousapelli
Where YunHo Isn't Always the Leader by out_of_words24 OT5/YunHoxeveryone - watch out for the HoSu~
Look Like A Dream by ranalore OT5 + HoSu
Color My World by jumoon
Whodunit? by quirke Gen + HoSu
Solaris by awoken
link due to explicitness
In their own words;
From Bigeast Ep 26
fan: who is the purest among the members?
min: obviously it's me, changmin!
yunho: i was thinking, isn't it junsu? junsu has a very pure personality, too. the way he laughs gives me a pure feeling, too...
The entire time, the others are actually picking on JunSu, and ChangMin even says he's so innocent he's like an elementary school student. xD But YunHo keeps insisting... ♥
another Bigeast Station ep
Yunho: Here's a question for you. You're walking alone at night and someone's following you. Who is it? Please answer with the name of someone you know.
Yunho: What about you, Junsu?
Junsu: I immediately thought of Yunho.
Yunho: Me? Why? Hahahaha.
Yunho: Yes, I see.
Junsu: What do you mean?
Yunho: The answer is supposed to reveal the person you really like.
Yunho: Uh.. Junsu chose me. You are indeed v-very kind..
Junsu: Honestly, Yunho was my first thought.
Junsu: Because I just have a feeling you might.. follow me.
translated from Korean by trolleys
HoSu are so cute how can you not love them?! ... Yeah, that's a totally convincing argument, I'm sure. :] I think the videos are enough argument in and of themselves.