How Sweet is a Sugar Daddy?

Si-Hun is handsome, cultured and rich. What else would you expect from an established doctor? He's everything that Jun-Yeong wants to be, once he gets out of college. Oh, and Jun-Yeong's not gay. At least, that's what he says... While he's more or less having sex with Si-Hun. A man. A married man. A married man who happens to be dating his his best friend, Ma-Ri. (Source: Lezhin US, edited)