Hyeonjo (?) didn't cheat (?) but he still gets swept off on his feet and cling to the part that if he let's Myeong stay by his side, everything would be alright. That's just a red flag you know, even if he thinks it's for the betterment of their relationship, when it's on the edge. Yena just came to the picture and nudge their 8 years relationship and that's it. So, idk why some of you were feeling bad to the guy.