The show holds up until the fifth episode, then it's a total disaster. Long story short, save your time.

[SPOILER ALERT]

All the characters make a 180° turn up at one point, totally out of nowhere.
○ His crush confesses he's in love with him, but Ko Mu Yeong holds the lie of a fake boyfriend because he thinks Seon Ho is dating PD Lee. Like, what?
○ Han Joon Seok has already a weird relationship with his fiancée, letting her down many times to catch up with his best friend. Then, he kisses Mu Yeong to create jealousy, when instead he wants to kiss him. And finally, he becomes even more selfish, asking for Mu Yeong to take care of him after the incident.
○ Yoona (poor girl, I feel so sorry for her) has every right to be pissed off, but the threaten to outing her ex bf shocked me.
○ Shin Seon Ho was a cinnamon roll and I fell in love with him immediately, but then he begged Mu Yeong to leave his boyfriend to get with him. And in the end he also gives him an ultimatum between himself and the friend. I get he's pissed, but that's a bit overdramatic.

People in real life is selfish, however I think that's too much even for real people. But wait, there's more:
Mu Yeong confesses he has lied to Seon Ho for days, and Seon Ho only reacts saying he was pretty hurt. Man, he should have lost the trust in him. And here they had to "force" the "break up". Apparently, he's so in love he's okay to be treated like shit.

Then, when the hell do Mu Yeong and Seon Ho become boyfriends? Again, out of nowhere.

Last question: Korea, are you okay?