When Did I Become Invincible?

Chen Zifeng, who traveled to the fantasy world, obtained the titles of "Piano Saint", "Chess Saint", "Painting Saint", "Calligraphy Saint"... With the help of the system. However, these are of no use. "Ah..., When will I be able to cultivate immortality after the death of the system!" System: "It has been detected that the host has a wrong understanding of itself." "Huh?" "It has been detected that the host's realm is invincible." "..., When did I become invincible?" This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.