Bitter Sweet Hell

Season 1, Episode 4: Mutual Assistance

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Although Young-won is unhappy about Sa-kang concealing his affair from her, they prioritize gathering clues to find Jae-jin. Following these leads, they eventually arrive at Yokji Island. Shortly after getting there, they hear about a submerged car being found in the sea. Sa-kang immediately questions whether it's the vehicle her son rented.