"I deliver everything that the post office service does not handle." Eun-ha, who is a normal junkyard employee, secretly works as a delivery clerk that deals with unusual delivery requests.

Ma-Ha is a member of girl group Teaparty. The other members are Ri-A and Hyun-Ji. Since their debut, they haven't achieved much success. Ma-Ha has received some attention due to her resemblance to popular singer Ri-Ma. Teaparty then takes part in a reality TV program, involving popular idol groups participating in sporting events. Ma-ha wants to catch the attention of viewers. Meanwhile, Kwon Ryeok is member of popular boy band Shax. He is well liked and is good at singing, dancing, and acting. He is also focused on maintaining his success. He doesn't like Ma-Ha, who imitates the appearance of popular singer Ri-Ma. During the TV program, Hyeok from boy band Shax gets injured due to Ma-Ha. Kwon Ryeok bursts out with anger at Ma-Ha. She also receives hate from other people. Ma-Ha doesn't want to see Kwon Ryeok anymore, but they cross paths on TV programs and while performing in a drama series.

Oh Hyun-Jae used to be a top criminal profiler. He solved many cases with his skills, but an explosion, caused by a serial killer, ended the life of his fiancé. After the horrific incident, Oh Hyun-Jae vanished and he now lives in seclusion. Meanwhile, Cha Soo-Young is police officer in a rural area. She has a special ability, which allows her to remember everything that she saw. Due to her special ability, she is selected as a rookie detective who will partner with Oh Hyun-Jae informally.

Although born in the same year, two childhood friends end up being 13 years apart because they have aged surprisingly at different places (worlds) for some strange reason. Now Eom Hyeon Soo is a 31-year-old woman but Sung Hae Sung is still a 18-year-old boy. Cha Won Yooung is a chef also interested in Eom Hyeon Soo.