[Spoiler] "W" Lee Jong-suk gives Han Hyo-joo wedding ring and says "You're free"
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Oh Yeon-joo planned to make it a happy ending but Kang Cheol told her that her father had killed someone so her happy ending wouldn't come true.
Kang Cheol said, "My happy ending is a sad one for Jin-beom. So that means your father will disappear. One of us won't be with you and it's too tragic for a father to kill her daughter to survive. I will delete you from my family list. You're free now". Then he took off his wedding ring.