The door had been left ajar to begin with.
The two lads were having fun in the snow. As the snow piled up, they, as well as their uncle, decided to split into teams for a snowball fight. Little Yichen was leading the game when his younger brother clamored for their father to join in as well. The kid wanted to form a team with him, while his older twin could partner with their uncle.
This suited Gong Jie just fine and egged his brother-in-law on.
Mu Yazhe did not join them at first but agreed subsequently. He returned to the house for a pair of gloves so that he could join their snowball fight when he chanced upon the mother-daughter trio badmouthing his wife.
He had excellent hearing and could pick up Yun Qingmiao's jealous grumbling when he passed by the door. That made him stop in his tracks and put in a strong rebuttal on behalf of his wife in front of them.