The Yandere ML Who Actually Is Protecting The FL

We've seen it before.

FL is tricked by scumbag and her family in to giving family and/or scumbag her [insert inheritance from her mother here] and is then murdered. At the funeral, she becomes a ghost and watches them 'mourn' her death and learns of their whole plot. During the funeral, her yandere shows up, kills the family and scumbag and then says something heartbreakingly loyal to the FL corpse before...well. You know. FL vows to treat her yandere better in the next life.

These are just the ones on MDL unfortunately. Not listed:

• Inviting You For the Rest of My Life - Wang Yu Wei
• Stealing Beauty - Wang Jia Mao