The Korean drama - Running Behind Sun Jae - tells a time-travel fantasy romance between a top male star who unfortunately ends his life and a woman who travels back in time to save him.

Ryu Sun Jae (played by Byun Woo Seok)

The top male star of the Republic of Korea who had perfect appearance, strength and charm never came down from the top position after his debut. However, his life in the entertainment industry made him exhausted and he eventually passed away.However, when he was 19 years old, when he was still young and brilliant, he met Ren Sui, and his peaceful life changed.

Im Sol (played by Kim Hye Hee)

A passionate fan who went back in time to save his favorite top star Ryu Sun Jae.Rensu, who gave up on his dream due to an accident when he was a child, found great comfort after accidentally hearing Ryu Sunjae's songs on the radio, and became his fan.One day as peaceful as usual, Yoo Sun Jae sadly passed away, and Ren Sol accidentally returned to 15 years ago.Facing high school student Ryu Sun Jae, Ren Sol fights alone to prevent future tragedies.

Jin Taicheng (played by Song Jianxi)

The bassist of the high school band, and the very popular “facezan” of Mini Nest.Likes to act coquettishly and joke, he joined the band not because of his love for music, but just to enjoy the warm cheers and attention he received on stage.He lives with his father, who is a detective in the crime squad. His mother left home because his father always put work before family, and he resented his father for this.He thought that Ren Su would be shy to confess to him like other girls, but she nagged her like an aunt. Taicheng found it interesting and deliberately acted naughty to Ren Su.

Baek In-hyuk (played by Lee Seung-hyup)

The leader and guitarist of the band Eclipse, he has an easy-going personality and is Ryu Sunjae's best friend.

Jay (played by Liang Hyuk)

The youngest member of the band Eclipse.

Park Bok Soon (played by Jung Young Joo)

Ren Su's mother, her husband died in an accident more than 10 years ago. Fu Shun relied on the rental income of the three-story building to support her two children and her widowed mother. When the children were naughty, she was faster with her hands than her mouth, but she felt bad afterwards..

Zheng Mozi (played by Cheng Byung-sook)

Ren Sue's amiable grandmother replaced her daughter Fushun, who had to work hard to support the family, and took care of her two grandsons since childhood. She especially loved the youngest grandson Ren Sue.

Im Jin (played by Song Ji-ho)

Ren Sol's brother, an actor student who is passionate about acting, but was eliminated in every audition.

Lee Hyun Joo (played by Seo Hye Won)

Ren Su's unique friend, reckless and cold, handles everything neatly.

Yoo Gun-deok (played by Kim Won-hae)

Sun Jae's father ran a chop shop. His wife died of cancer many years ago, so Gende raised Sun Jae alone.The son who has attracted much attention since he started practicing swimming and swept various competition awards is the only thing Gende is proud of. Taking good care of his son and training him to be Park Tae-hwan's successor is his lifelong wish and goal.

Representative Kim (played by Ahn Sang-woo)

The representative of Sunjae's agency successfully helped the new band Eclipse debut and reach the top.

Park Dongsuk (played by Lee Iljun)

Sun Jae's agent seems polite but has a very reckless personality. He seems to be cautious about looking at others, but he is an outspoken truth-taker.

Police Officer Kim (played by Park Yoon-hee)

Taicheng's father is a senior detective with 20 years of experience.He always puts work before his family. His unbearable wife went abroad after divorce, and his son Taicheng gradually became estranged from him.

Korean drama《Running with Sun-jae on his back》Introduction of guest actors

Park Tae-hwan: A swimmer who gained national attention after winning the 2008 Beijing Olympics championship.

Kwon Yuri: A member of the legendary girl group Girls' Generation. With the song "Say Your Wish", she started a uniform craze and was enthusiastically loved by the public.

Han Seung-yeon: Radio DJ. When he debuted in 2007, he achieved great success with the song 《Honey》《Mr.》 and surprisingly supported the new band Eclipse.