Name: Kwak Taeheon
Age: 30
Source: Instant Family
Name: Yosef han
Age: 26
Source: Love so pure
Gu Yoon-Hyeok
Age: 35
Source: Spilled Blood
Name: Risky
Age:?
Source: Risky Vice
Name: Park Taesung
Age: 29
Source: Legs that won't walk
Name: Yong In-yeom
Age:?
Source: ASHTRAY
Name: Yohan Romanoff
Age:?
Source: EDEN
Name: Kang Seung-tae
Age: 32
Source: Beasts of Desire
Name: Caesar Alexandrovich Sergeyev (Tsar)
Age: Early 30s (not specified on manhwa)
Source: Roses and champagne
Name: Liu Yuan
Age: 26
Source: One way romance
