Forgot

Hello! I forgot the name of a romance manhwa I read:

The FL has mid length light brown/beige hair and was the ML’s childhood friend (blonde, blue eye). The ML got together with a girl with red hair. The FL had and unrequited love for him and never acted on it. In the end, she sacrificed herself by protecting him and died. He was grieving over her and then he finds out that his lover was the one who relayed info to the enemy and indirectly got everyone around him killed. He ended things with her and ended up going back in time. The FL and ML both have their memories of their past life. It seems as though the FL has been through multiple lives before (can’t remember if she knows the timeline due to it being part of a story or if she just repeated it multiple times).

Anyways ML changes things and pays all his attention to FL to make up for everything, possibly due to his guilt and gratitude. He starts sticking around the FL and taking care of her 24/7. He’s cold to his past lover and the exlover is bothered since they just met. At one point she cries in front of him and he feels swayed a bit because she was his past lover but other than that nothing else happened. And he eventually ends up falling deeper for the FL. All his attention is on the FL and being devoted to her as well as making plans to fight against the enemy that caused the tragedies before. His exlover ended up liking her friend (which was their mutual friend) and got together with him. That friend with dark hair also was the one who was a spy for the enemy. He was the guy that the exlover relayed info to, which she mistakenly trusted.

Some extra info:
I think they attend school and the FL wears a beige or light yellow long sleeved dress. Her hair is normally tied in a braid or side pony? FL also has this guardian dude who’s like a wizard. The enemy is the prince, he has dark hair as well- and she previously was engaged to him in the last life. He still wanted to take her as his in this life due to being enemies with the ML.