The world’s largest aquarium – “Living Sea Aquarium” ushered in its first opening day, No one expected that the hidden (invisible) crisis would spread quietly in the blue water… Suddenly unknown creatures are going rampage in the aquarium. Zhang Chen, a diver who suffers from depression and Zhang Xing, a rebellious, sensitive and cold-hearted student. How will these two brothers who have never been friends unite and cooperate. The question also remains, how will these two brothers find each other and a way to escape?