Given who the character is, I imagine she will love him the same. But my fear would be that the blood parents might reappear..especially if they discover their son has ties to a person with money.
I don't know the laws in Thailand..so I don't know what parental claim a person can make years later after abandoning their child. But I do know in some parts of the world, a parent can change their mind and reclaim their kid. Heck even in the US it's messy.
Had a teacher taking care of a foster kid for 2yrs, but when she went to adopt him, the orginial mother changed her mind and wanted him back (and somehow legally, she had the right to change her mine prior to adoption). Broke my teachers heart to lose him.
I have a feeling the story will go down a similar path..but given how fluffy and light hearted it seems to be, it'll obviously turn out fine in the end.
Why the heck would you not love a child your gf adopted