Lan Xichen is Lan Wangji’s older brother.Although Lan Wangji is reticent, Lan Xichen understands his thoughts very well.Jin Guangyao is looked down upon by others because of his status, but Lan Xichen treats him like a friend.When he learned what Jin Guangyao had done, even killing his elder brother Nie Mingjue, he was very disappointed with him.