[Two male protagonists + cultivating immortals + conjugating master and apprentice + slightly sour and slightly funny + group portrait + secondary CP]
Luo Jiuchen is the youngest Wu Nian Immortal of the Xiaojian Sect. He is aloof and ascetic, but he has a dull-witted young disciple, Qi Poxiao.
Until one day, he discovered that the tune his apprentice hummed unintentionally was actually his long-lost natal sword technique.
Late at night, Luo Jiuchen looked at the sleeping Qi Lixiao and whispered: "Master... I will protect you in this life."
Qi Poxiao opened his eyes and said in confusion: "Master, why do you want to kowtow to me?"