never mind just saw how it ends ...
spoil a little
spoiler written in the comment section by being-you :
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SPOILER
Kyujin cheats on Doyeol with his student Jimin ..heartbroken Doyeol let him go & step out of their incestuous relationship ..Kyujin & Jimin starts their relationship...Times passes Doyeol gets married to some girl but later found that the marriage was fake ..later ends up having sex with Doyeol hence by cheating on his current lover Jimin again ..In the end he left everything & ran away but left two letters addressed to Doyeol & Jimin ...It was another open ending which felt like premature ejaculation. But i liked it kinda felt like guilty pleasure.
can someone tell me how it ends?