I mean I wouldnt say he was so green flag at start. Espacially how he treated his previous partners and that thing he did at the end kinda put me off.
Just like Alex they both just played around and changed once they got feelings
He's a dom/sadist. When he plays, he just plays. It has consent. When they are done, they are done. If they get clingy to him, he get rid of them. He specifically said his boundery, and yet they fall for him. He didn't mistreated his former partner (Seunghyun, the one Chanwoo dated but turns out he just want yo reconnect with MD), he just got clingy so MD let go of him. Same goes with Chanwoo. He wanted yo just play with him, but this time, he fell for Chanwoo, he even asked him to date him but Chanwoo rejected him because 'he's old' and MD deserves better yet Chanwoo finlly said his safe words when he was threatened that MD smiled when Seunghyun kissed him. That's why among 4 Tops of Mingwa, MD is the green flag one.
Myungdae/BJ MD (BJ Alex) is the only green flag among 4 Tops of Mingwa (that's why I love him and he's my favorite). Anyways, these crazy and toxic tops will eventually chase their bottoms once they leave them and falls hard for them. I'm gonna laugh hard for Jaekyung and Heesung soon.