
Let’s remember masato forgot his own birthday as well. I don’t think he really cared/care that asahi hasn’t noticed it either because masato has been more worried about asahi and trying to get him to open up more .

I think Masato just forgave him right away and considered it as "not a big deal" considering how Masahi was busy. But he might have been quite hurt, and we might get a flashback of it. Because even if you dont csre about your birthday, someome who forget it implies that for them its not important either. And thats whats painful.
But its also possible that Masato didnt care at all as you said.

Only putting a spoiler warning because people may feel this is a spoiler .....
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Okay for one mr.han is a grown man making excuses ....
And secondly I’m disappointed in param after seeing what happens the next few chapters, like you knew how hwi felt ...... smh, but I guess ya made your decision
┑( ̄Д  ̄)┍

https://newtoki91.com/webtoon/9389351?stx=안티피티&toon=BL%2FGL Here are the raws.. T_T
It was good fluffy manga but for some reason after there was no more neighbor appearances I got kind of bored ╥﹏╥