承接第三部。阿诚与妻子渐渐感觉失去的兴趣，同事约阿诚去滑雪，期待邂逅女性，没想到阿诚把小野带上了。阿诚夫妇和同事2个一行四人开始了滑雪之旅，在滑雪场，他们遇到了一个神秘女子······
It's not...something you should say... You always bring women home... Jeong-soo is far from getting his grades up after he breaks up with his girlfriend so his father gets him a tutor (Yoo-jin). Let's go to your room to study. Jeong-soo thinks Yoo-jin is just one of his father's many women and she approaches him with kindness. Ordinary love...like everyone else.... Jeong-soo wasn't good at ordinary love and starts getting special lessons from Yoo-jin. As they get closer, he feels something lingering in his heart...
