A couple struggling with the husband's erectile dysfunction finds an advertisement for a hot spring said to increase virility. They decide to go on a trip, hoping it will help both their relationship and the husband's health. However, the hot spring has no effect on the husband but miraculously works on his father-in-law, causing him full arousal against his wishes. Despite her initial intentions to assist, the wife, Rui-sa, becomes increasingly attracted to her father-in-law's newfound vigor. As they navigate through their desires, their passionate encounter leads them down a path filled with lustful interactions... #BossP