What is the oath of the sea of clouds and the rain nettle in Meteor Shower?

I, Mr. Murong, swear to the sky, the earth, the clouds, the wind, the flowers and the rainbow that I will only love Chu in my life until I die!

Murong Chu Shi, do you like the rainbow that Murong Haiyun gave you?

Here it is. You can watch it again. Oh, it's so classic.