Ahn Dajeong from Excuse Me This is My Room. Requested by plsssn.
Tbh I didn't like her due to how she treated the MC but MC was at fault for spending her money. Most of the entire manga is just the MC being her toy. But later in the series, MC saved her from marrying someone else. She admitted to having feelings for the MC and even decided to let MC doing whatever he wants as a way of her wanting to face the consequences of how she treated him.
Credit goes to civitai for lora creation.