Which episode is this scene when Lan Wangji smiles at Wei Wuxian on the roof? I was watching this MV of Mo Dao Zu Shi and the part on 5:08-5:19 when Lan Wangji smiles at Wei Wuxian on the roof is what I haven't seen in the Anime/Donghua.

Where is this clip from?
Here: https://v.qq.com/x/cover/k4mutekomtrdbux/c00266t1cjf.html

It's from Episode 0 —— SPECIAL WELFARE(Means it's a Cornetto advertising).