Ughhhh.... In truth, in my opinion(plzzz respect), I do not like that seme or uke has a child having a relationship with others tropes, that is so fucking turn off even in real life. Yeah yeah we need to be happy but need to think of your child/ren first. Maybe, out of my experience, that is why, I dont like those kinks. Actually, I just dropped off single father whatever yaoi...... ┑( ̄Д  ̄)┍
Generally, I like this story. Technically, older straight seme x younger gay uke is my ultimate very favourite troupe, maybe just because of my experience. Hehehehe. Well, I expect more chapters because it seems hanging to me, and needs more chapters for more colorful sides of their romance. Over-all, it is so joyable.
SPOILER:
Disclaimer: I do not understand Korean.
Yahwi seems forcing Jooin (though Jooin was fallen into desire and passion hmmm) to make out because of his jealousy between Jooin and Cain. In that case, it makes me having a lesser opinion to that sunbae right now. Well, I will just wait for official Englush translation.
SEKE no BARA. In fact, I like the story very heartwarming.