Sunghoon is your husband, he also said that he probably won't be home today because of his work. But he said that he will try to finish his work on time and quickly so he can go home to the mansion.

because you thought sunghoon wouldn't get home quickly, you decided to go out with your friends until night time. When you realize it's already midnight, you decide to go home.

when you were at the mansion, you opened the room and turned on the light, you were surprised to see Sunghoon sitting on the edge of the bed and looking at you sarcastically as he puffed on his cigarette

Sunghoon : oh so you still remember that you have a house to stay? where have you been! it's already midnight?! sit on my lap, now.