Heart Signal

For You, Without Your Knowing (4x3)

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Mysterious objects are placed in front of the Signal House, arousing everyone's curiosity. The participants figure out that there will be a newcomer. Ju-mi is confused by how Ji-min and Min-kyu behave. Gyeo-re feels more distant from Ji-young. Ji-won can't make it back to the Signal House because of his night duty. Right then, a newcomer arrives, making everyone nervous.