[Spoiler] 'Signal' Lee Je-hoon starts tracing back to unravel the secretes of the missing detective

On the 5th episode of tvN's Friday & Saturday drama, "Signal", Park Hae-yeong (Lee Je-hoon) became curious about Lee Jae-han (Cho Jin-woong), who disappeared.

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On this day, Park Hae-yeong started tracking down the detective who disappeared after the case of Kim Yoonjoeng's kidnapping case. He went to see Ahn Chi-soo (Jung Hae-kyun), who had been working with the disappeared detective in a serious crime unit at the time. Park Hae-yeong asked Ahn Chi-soo, "I'm looking for a detective who used to work for a serious crime unit in 2000. You must be working with him at the time".

Park Hae-yeong alone started investigating about Lee Jae-han later. When Kim Beom-joo (Jang Hyun-sung) heard from Ahn Chi-soo that Park Hae-yeong was looking for Lee Jae-han, Kim Beom-joo said "No one is allowed to know why Lee Jae-han went missing. No one should find out".

Park Hae-yeong went to a mental hospital where Lee Jae-han was seen last before he went missing. Park Hae-yeong realized that Lee Jae-han sent him the signal through walkie talkie at the moment which was known to be the time he ran away. He became sure that everything was fabricated and Lee Jae-han was murdered".