SHINee:

JongKey
OnKey
MinKey
TaeKey
OnTae
2Min

TVXQ:

JaeHo/YunJae
YooSu

EXO:

TaoRis
ChenMin
KaiSoo
HunHan
SuLay
BaekYeol
Everyone x Tao

Block B:

ZiKyung (Top!Kyung)
JaeCo
ZiBomb (Top!Bbomb)
ZiKwon (Top!Ukwon)
2Ji
BangCo (Yongguk x Zico)
TaeHo/Co

BAP:

BangHim
BangLo (mainly Top!Zelo)

Super Junior:

KyuSung
HaeHyuk
ZhouRy
YeWon (Top!Siwon)
KangTeuk
HangChul
TeukSung

BigBang:

GTOP
YBGD
DaeGon
SeunGon

Infinite:

MyungYeol (Top!Sungyeol)
WooGyu (Top!Woohyun)
MyungGyu

These are the major OTPs I ship within major-ish Kpop male groups xD (I don't have time to name EVERYONE I ship xD