@meloshhie if i got it right, the system shows the heart amount of a person in that moment and in total. Shim Su-ae's amount is 2 at the moment (Go Eunhyeok and Baek Dohwa) but 0 in total which makes no sense, that's why the system doesn't work well with her.
Idk if i understood it correctly tho, hope this helps :)
Idk if i understood it correctly tho, hope this helps :)