Yuri's father-in-law had been enjoying a peaceful retirement, but he finds himself captivated by the charm of his son's wife, Yuri. Yuri treats her father-in-law with kindness and appears genuinely affectionate toward him. However, his feelings gradually shift from mere paternal affection to romantic desire. When he discovers his son's infidelity, he decides to protect Yuri—whom he now sees as his own wife—and driven by masculine pride, takes decisive action.