The "Sunshine Never Sets" B&B is located in the picturesque resort, Hainan Island, where the water is clear and sandy. Ke Yun is an employee of this B&B and a core member of environmental protection. Apart from work, she must press She dives underwater to observe the ecology of coral reefs from time to time, and collects samples for testing when needed. Although she may seem monotonous, she is dedicated and happy every day, and her cheerful and helpful personality reflects each other with nature. One day, she ran into the airport with the sample, and in a hurry, she bumped into a boy who made a thousand waves in her heart----Yang Sining.