2004–2010: Beginning In 2004, Lei Jiayin acted in the costume comedy drama
Pretty Girls in Jianghu, which was his first time to act in the TV series, thus officially entering the entertainment industry. In 2007, Lei starred in the family drama
Lost. In the same year, he starred alongside Guo Jingfei in the wuxia comedy theater play
My Own Swordsman. In 2009, Lei made his big screen debut in the movie
1977 College Entrance Examination. Later, he starred alongside
Yao Chen in the romantic comedy
Days with the Air Hostess. In the same year, he starred in the workplace comedy
Go Lala Go. In addition, he also co-starred with Yao Chen in the theater play
Go Lala Go. In 2010, he acted in the theater play
21 Karat directed by He Nian, and
12 Angry Men adapted from the American film of the same name. In the same year, he starred in the romance comedy
Princess Single Blind Date in Mind.
2011–2015: Rising popularity In 2011, Lei starred in the highly popular family drama
Home Temptation. In the same year, Lei starred in the revolutionary drama
Borrow Gun. He won the most promising newcomer award of the 15th Zolin Drama Arts Awards. In 2012, Lei starred in the action comedy
Guns and Roses, which was his first leading role in a film. He won the Best Actor Award in the 11th
Changchun Film Festival, and the Best New Actor in the 7th Chinese Young Generation Film Forum Awards for his performance. In the same year, Lei acted in the family drama
Mother-in-Law is Here, and family comedy
Baby. He won the Best New Actor award at the 3rd LeTV Awards. In 2013, Lei starred alongside
Tong Liya in the urban melodrama
Weaning, which was his first time using a dialect in a television series. In 2015, Lei starred alongside
Yuan Shanshan in the family drama
The Nanny Man. In the same year, he starred in crime suspense film
Memento Mori, where he played a lawyer.
2017–present: Breakthrough and continued success In 2017, Lei starred in the romance television series
The First Half of My Life adapted from the original novel by Hong Kong female writer
Yi Shu. The television series was a major ratings hit in China and Lei gained increased recognition with his portrayal. He then starred in period television series
White Deer Plain adapted from
Chen Zhongshi's representative work of the same name. In April, Lei starred in the wuxia film
Brotherhood of Blades II: The Infernal Battlefield, Lei earned critical acclaim for his performance, and was shortlisted for the Best Supporting Actor Award in the 54th
Golden Horse Film Festival and Awards. Lei also starred alongside
Deng Jiajia in modern workplace drama
White Elite. In 2018, Lei starred in the fantasy romance comedy film
How Long Will I Love U, which was produced by
Xu Zheng. Lei then starred alongside
Liu Ye in modern romance series
Old Boy. The same year, Lei starred in the spy drama
Peace Hotel as the courageous and resourceful hero Wang Dading. In 2019, Lei starred alongside
Tang Wei in the film
The Whistleblower. Lei also starred alongside
Jackson Yee in the historical mystery web series ''
The Longest Day in Chang'an'', which was adapted from Ma Boyong's novel of the same name. From 2019, Lei has been a permanent cast member on Chinese variety game show
Go Fighting! Lei starred alongside
Yang Mi in the fantasy suspense film
Assassin in Red which was directed by
Lu Yang. The film is set to be released in 2020. ==Personal life==