Kath is a beautiful woman, confident, good and hardworking in her work. She is kind, helpful and cheerful person. You don't think that she also suffered from the difficult and unpleasant experience she had in her love life and in her family, For being a good and cheerful person, she was the one who suffered a lot from the painful treatment of her family and the cheating of her first Boyfriend who she had a relationship with for 4 years.and in an unexpected event, because she first went to Italy with her boss so they could meet one of the youngest rich heirs of the most famous company in Korea to give it a proposal to become an investor of the company because of their bad meeting, kath didn't expect that the person she was facing was the person they wanted to get. Kath didn't see the person that they were looking for right away because of her annoyance with him and she realized it during the meeting itself. Kt didn't accept the proposal for another reason but he didn't say it. Thunder kurt kim or KT is known as a very arrogant, disrespectful, high opinion of himself, emotionless, very serious, meticulous, and powerful man. also he doesn't want to be called thunder, he hates to hear his first name and even his family forbade him to call him that. At a young age, His father trusted him to lead their other company and grow it. TK did not disappoint his father even though he behaved differently and he changed a lot due to failure in love, so he treated women differently and was single for a few years. he looks like he doesn't care but inside his heart he has a feeling, he also doesn't want his family to be in trouble so he worked hard to make their company bigger so that his parents can be happy and proud, because their family is in chaos since his father gave the company and his older brother got angry and left their house because he should be the first because he is the eldest. So he doesn't want them to mess up and he wants to make his parents happy without being noticed. Kath and Tk are like cats and dogs that always fight whenever they meet, but we have a saying that "The more you hate, The more you love." so they reach the point where they gradually fall for each other and confess in an unexpected opportunity because of jealousy. Everyone can change, as well as what they used to be, because of their bitter experiences. But Because of their deep love, they will be fair, understanding and appreciative with mutual respect.