[1] Xu was qualified to be a trainee in several South Korean entertainment companies, but she never signed contracts with them to focus on her studies.
[5] In the beginning of 2020, Xu participated in the girl group survival show Youth With You (season 2), where she finished in 18th place.
[12] On February 19, 2021, Xu released her first self-composed EP "IN", which was composed of the songs "My Gravity (地心引力)", "Hunger (饿意)", and "VIBE".
[15] On July 18, 2021, Xu was officially announced as a contestant in Mnet's upcoming survival show Girls Planet 999.
[16] Despite being able to survive in the second elimination round, she left the show shortly after the announcement due to health issues and finished 8th in C-Group.