In the ABO world, Lu Jin was originally an A, but later differentiated into an O. For the sake of face, he pretended to be an A.
Cheng Si: "Why do you have o pheromones on you?"
Lu Jin "Something else"
Cheng Si:? Is the Flower of the High Mountain in love?
When two people who don't know how to fall in love come together to fall in love:
Cheng Si: "Do you know how to kiss?"
Lu Jin "gags"
Cheng Si: ... It seems to be no problem.
Purpose: personal preference
