A man and a woman are on a blind date. During the meal, the woman asks, "How did you get here?" The man replies, "Shared bike. How about you?" The woman says, "Bus." After finishing the meal, they part ways. The man goes to the garage and just gets into his BMW X5 when he sees the woman opening the door of an Audi A6 nearby. They exchange a smile. The man drives to the rental company to return the car and happens to see the woman also handling her return procedures. Feeling quite annoyed, he thinks, "Maybe I should just get a foot massage." When the masseur comes in, it turns out to be the same woman. After the massage, the woman thinks, "Why is today so coincidental?" When she gets home and orders takeout, she opens the door and finds that the delivery person is the man... In this world, why do people all wear masks?