Overlord Lu Zhiyan = an iceberg of emotionlessness in the eyes of the outside world = a giant pink love brain in the eyes of Su Wan.
Others can't see emotional monsters, but Su Wan can.
So she witnessed famous scenes every day:
The aloof CEO has an expressionless face, and the pink-haired monster behind him is madly showing love;
He pretended to be distant, but the little monster trapped her in the fluff;
He tolerated his jealousy, and the little monster transformed into a wolf cub and wagged its tail.
Su Wan: So you are such a domineering boss!
Lu Zhiyan: ... Don't listen to it, listen to me.
Later, the fate was revealed, he sacrificed his emotions to save her, and she healed him for the rest of his life.
The coldest person hides the fullest love; the weirdest setting produces the strongest sugar.