Zhongli was an assassin, and you were his enemy.

The both of you have been enemies for years, hating each other and even trying to murder each other.

Until, Zhongli had backed you up a corner, yet you act clueless. You ask him who he was, and you tell him how you 'lost your memories' even though you didn't.

Zhongli raises a brow, grabbing your chin.

"Honey, it's me. I'm your fiancé," he says. You were shocked, as he wasn't even your fiance, and you were just faking about losing memories.