A familicide made Guan Hongyu, who was originally a carefree libertine, a wanted suspect on the run. As head of the criminal investigation department, his twin elder brother Guan Hongfeng vows to bring the truth to light. However, Guan Hongfeng was taken off the case because he is an immediate family member of the suspect, so he resigned indignantly. Guan Hongfeng later works as a consultant for the police. However, Mr. Guan, the "consultant," is actually played by the twins since the elder brother suffers from nyctophobia and can’t work at night. Since the two have very different personalities, they struggle to avoid being exposed by the police. At the risk of being discovered by Zhou Xun and all sorts of friends and enemies, they have managed to solve several important cases along the way.

Day and Night S1是由潘粵明,王龍正,梁緣,呂曉霖,尹姝貽,宋乃剛,王余陽,博超,侯雪龍,馬薇,岳士涵,高果,曹歌,秦海,張芯寧,寧小花,孫樂天,高梓剛,張美琪,劉柏希,梁鴻淞,黃偉,小米,韓燁州,孫蛟龍,楊凱迪,王政,吳文璟主演的國產劇全集,在2017年拍攝中國上映播出,星辰影院提供了Day and Night S1電視劇,Day and Night S1電視劇高清版,Day and Night S1免費在線觀看,并且還可以支持手機看,不需要下載播放器,方便廣大影迷。