He was acting like he’s drawn to him and he is. He said once he found him he’d know instantly which tbf, his body seems to know but his head hasn’t caught up yet. So rn only the MC knows and that’s because ML told the story of how he met his first love. I’m betting on a couple of scenarios of him learning about it.
1) MC just tells ML.
2) ML sees MC’s brown form and puts it together.
3) ML sees MC’s white form and puts it together.
4) Or maybe someone else tells ML.

wait he still doesn't know his first love is our cute veasel?
i thought he knew , that's disappointing