In "Signal" Kim Hye Soo died when there was an explosion of LPG which was unexpected, surprising everyone including her staff and family.
On the episode of tvN Friday/Saturday drama "Signal" (script Kim Eun Hee, director Kim Won Suk) broadcast on Feb. 6th, Soo Hyun (played by Kim Hye Soo) ran to the frozen car to rescue Shin Yeo Jin, the daughter of a construction company mogul. This person had been kidnapped but she was trying to rescue Shin Yeo Jin.
On this day, Hye Young learned that when the Hanyoung bridge incident occurred where Kyung Tae's daughter had died, Kyung Tae was seeking revenge and therefore wanted to get back at Yeo Jin and her father.
In addition, Hye Young learned that when Kyung Tae was in prison, he had learned about electricity wiring and therefore, wanted to explode the car using LPG gas. At that time, Soo Hyun had gone over to try to rescue Yeo Jin.
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. It is broadcast on Fridays and Saturdays at 8:30PM.
