They should have had Chan acknowledge his classmate's feelings towards him. She showed up whenever she was supposed to, as a partner is expected to.

His races? She was there.
His practice sessions? She was there.
He needs hyping up? She was the loudest cheering him.
His friend is in need of clothes? She showed up with the best collection, even though she stole her sisters clothes but she WAS THERE. Yes she got a bit jealous but who wouldn't? She wasn't even toxic towards FL.
He won the medal? She was hanging banner on the school gate.

Leaving her feelings unacknowledged was such a weak ending for this drama that it almost hurt me.