I don't usually like cheating story but this one's has a unique plot and I even like Masami.
He can be dense and lacked common sense but as soon as he knew he's hurting tora, he's making an effort to change.
It's not like a regular cheating story where everything started off perfect and then he started cheating.
It started off with cheating and him realising his shitty attitude and then trying to be a better person. He fix his mistakes honestly, taking a beating and all(he knows he deserves it).
No one's perfect but as long as you try to improve I love it.
I love moogyeong bad sleeping habits