Family: The Unbreakable Bond

Kwon Do-hun is an affectionate husband and father, but he is always late or absent at every family event because of his overwhelming work. After putting up for ten years, Kang Yu-ra finally loses her temper and invites Do-hun's ruthless supervisor, Chief Oh Cheon-ryeon, to their home.

Even after meeting Chief Oh, Yu-ra can hardly discard her suspicions. Meanwhile, Do-hun prepares an event at a luxury hotel for his wife.

Yu-ra and Chief Oh encounter again at the hotel suite Do-hun booked. Do-hun attends his daughter's school play and meets his friend, Thomas Wolfe.

Do-hun learns the truth while searching for the sniper who injured his colleague during a mission. Wolfe becomes the target of another sniper.

Chief Oh notices the gunshot wound on Wolfe and recalls someone. Yu-ra gets a call and hears a voice she had long forgotten.

Do-hun is troubled after getting unexpected information about Chief Oh. Yu-ra comes face-to-face with the mysterious caller.