In "Signal" Lee Je Hoon and his brother were half-siblings
On the 13th episode of tvN Friday/Saturday drama "Signal" (script Kim Eun Hee, director Kim Won Suk) broadcast on Mar. 4th, it was revealed that Hye Young (played by Lee Je Hoon) and Sun Woo (played by Chan Hee) his brother were from different fathers where their mother had remarried.
In the pat, Jae Han went down to IN Joo again and learned that Hye Young was Sun Woo's brother. Then, Jae Han went to find Hye Young and Sun Woo's mother.
Hye Young's mother said that Sun Woo was a child that she had had with her former husband and said that Hye Young better leave with his father. He then said, "They're both children for me" and started to cry.
With that, Jae Han went to Hye Young's house and met the young Hye Young there.
Meanwhile, "Signal" is about two detectives - one from the past and one from the present who communicate through walkie talkies to resolve long-time unresolved cases.
