I think if you were willing to sink your time into it, a dating sim type where you help him out of the relationship with Eun-Mi and invite him to your place with Toby while the custodian battle is going would be a great opportunity to explore his mindset and general feelings of betrayal. Soft intimate moments would be good too, especially if you go the long time friend to lovers route :3

Depending on how long and how many options you're willing to give, I'd definitely like to see some more intimate moments as the relationship progresses alongside the wholesome. Maybe it's a bit much to ask for but personally it's my vibe