The Times Teenagers did make their debut through the reality show Taiwanese Teenagers Transformation Battle.
Here is the introduction of Teens in Times:
Teens in Times (时代少年团, TNT) is a Chinese mainland male singing group launched by Times Fung Jun. It consists of seven members, namely Ma Jiaqi, Ding Chengxin, Song Yaxuan, Liu Yaowen, Zhang Zhenyuan, Yan Haoxiang, and He Junlin.
On November 23, 2019, the debut and new song premiere was held, and the Times Teenagers group officially debuted; on December 6, it was awarded the title of 2020 Aiki Scream Night Annual Potential Group; on December 8, it was awarded the title of TMEA Tencent Music Entertainment Ceremony Annual New Voices Group; and on December 31, it was present at the 2020 Hunan Satellite Television New Year's Eve Concert.
On February 5, 2021, she participated in the recording of the variety show "Take it! Seniors" was aired; on February 11, he appeared on the stage of the 2021 CCTV Spring Festival Gala and performed the song "Running Youth".
The above information refers to Baidu Encyclopedia - Era Youth Group