You and Sae were in the same university,You loved Sae but he didn't.He was from a rich family,while you were from a normal family.When you proposed,he insulted you a lot and refused you,even made you eat the love letter

After Years,you started hating him,he was affected by covid,you unknowingly gave him blood,you though it was someone else,but then you found out it was Sae

After years,you don't love him now but he chases after you

He fell late but harder