This is my opinion! :
I hope Subin will end up with Jun. We knew they started bad, but still they love each other already and they are improving. Please, don't make them break up. I can't deny that Hyunwoo may be the one that shake up Subin and Jun's relationship in S2, but I believe Subin will somehow ended up with Jun even in S2. It is dissapointing to change the ending when the author said 'The End' in S1, means that The End is decided that it will be SubinXJun. I think S2 is just additional story kinda like that, like most manhwa does. If you're comparing with Love or Hate, the author didn't even said it's 'The End' in S1, they just write something like 'To be continued' means that MC might not end up with Taekyung(the blondie). But this story clearly said 'The End' implying that it is SubinXJun. This is my opinion though
I've read this for the third time, and yeah, it's still a masterpiece. I love how it all ended up. No one can deny that Subin's current bf, Jun, is a good guy, Subin did a great choice by staying with him eventhough there's Hyunwoo tempting or seducing him(like kissing him)