[Spoiler] 'Signal' Cho Jin-woong could not stop his brother's death

On the 15th episode of tvN's "Signal", Lee Jaehan (Cho Jin-woong) in the past heard voice from Park Haeyeong (Lee Je-hoon) in the present asking to save his brother Park Seonwoo.

Lee Jaehan went to down to Inju hurriedly however, Kim Beomjoo (Jang Hyun-sung) was faster. Kim Beomjoo lied to Park Seonwoo that he was sent by Lee Jaehan and heard everything about the case of Inju from him. Kim Beomjoo killed Park Seonwoo in order to cover up the case of Inju and disguised the murder as a suicide.

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Lee Jaehan from a distance watched Park Haeyeong and his mother crying holding Park Seonwoo. Lee Jaehan shed hot tears while remembering Park Haeyeong's words.