An assistant to a TV producer, eager to stay off his bad side, promises to convince her former professor, a famous but reclusive academic, to appear on their show, which helps locate long-lost persons. Who does grey-haired Professor Yun Suk-Young want to see again more than anything? The answer to that question lies decades in the past.

When Joong-pil, the biggest bully in his high-school by far finds himself harboring feelings for a classmate, his entire identity is thrown off balance. Suddenly his smoking, his drinking, his constant swearing and his habit of pushing underclassmen into walls don't seem like good habits anymore. Without his nastiness, who is he? He might just like this girl enough to find out, if he can figure out how.

When Joong-pil, the biggest bully in his high-school by far finds himself harboring feelings for a classmate, his entire identity is thrown off balance. Suddenly his smoking, his drinking, his constant swearing and his habit of pushing underclassmen into walls don't seem like good habits anymore. Without his nastiness, who is he? He might just like this girl enough to find out, if he can figure out how.

Struggling financially, Me-ja and Dal-su live together, get pregnant unintendedly, and decide to sell the baby to a wealthy, infertile couple.

Moon-jung is a caregiver who has a son in middle school. After getting divorced, she can't bear to bring him to her house, a plastic greenhouse she has converted into a home. She strives to raise the necessary funds to move into a real home for her and her son.

Making use of her Chinese that she had picked up while living in China, Han-young obtains her tour guide-interpreter's license and starts working as a guide in Korea. She gets used to her new surroundings and gains good results at work. However, she is forced to face challenges and changes as she loses touch with her brother In-hyuk, and the number of Chinese tourists decreases due to political tension between Korean and China.

When young Jae-woo reaches the upper ranks of South Korea's national kendo team selection, he is shocked to learn his main competition is the man who accidentally killed his older brother.

Na-mi and Sun-woo, the outcasts in school, plan to commit suicide instead of going to the school trip. On the moment of success, they find out that the girl, Chae-lin, who made their lives miserable is living a new happy life in Seoul. So, they decide to make revenge before ending their lives. However, when they finally spot Chae-lin, they see a good-hearted girl in front of them which makes their plans go awry.

Violent father Moo-jin, whose family is everything. Mother So-yeon left because she couldn't stand the violence. Hoon, who loves both his father and mother, is forced to make a choice and leaves, but eventually remains alone and enters his world.

Gyun-woo is having difficulty forgetting the sassy girl. He then reunites with his childhood sweetheart, an elementary school classmate from China who was often teased about her broken Korean. They marry despite family opposition, and Gyun-woo has no idea what marriage has in store for him.