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In the fairy tale, the mermaid princess fell in love with the prince of the human world, so she made a deal with the witch, sacrificing her voice to sing beautiful songs in exchange for legs to walk on land, but the prince married another woman. In front of the heartbroken mermaid princess, the sisters who loved her presented a dagger from the witch. As long as you kill the prince with it before dawn, you can transform back into a mermaid and return to your hometown. However, the mermaid princess jumped into the sea and turned into foam. She would rather commit suicide than kill the person she loves most with her own hands... This is a "fairy tale" we are familiar with, but in this story, there is another "truth" - the prince of the human world is dead, and the weapon used to kill him is the witch dagger that is only owned by the mermaid princess. Everyone thinks that the mermaid princess is the main suspect. Only the sister who saw her sister turn into bubbles does not believe this accusation. The sister of the mermaid princess named "Elena!" Offered her heart to the witch in exchange for walking on human legs. This time, she did not come to the human world to court love, but to find the truth. She must detect the murder of the mermaid princess within the seven days agreed with the witch, otherwise, she will be the next mermaid to turn into bubbles. But, is the mermaid princess really not a murderer? With hopeless love, is there no hatred in her heart? Elena, who did not understand "love", listened to the countdown to life, embarked on a seven-day journey, and met a human boy...

In 2200 AD, the mysterious VR game "Huan Qi" is forcibly released, and its realism is breathtaking. Fifth Huan, a young man who was exiled by his family, and Qi Yumu, the arrogant young lady, unexpectedly reunited in the game and became partners in life and death. They were forced to get involved in the "Magic Tide" crisis. In order to save hundreds of thousands of NPC residents, they must travel through the forbidden mountains where space is broken and monsters are rampant. The origin of the game is a mystery and it is impossible to log out normally. It feels like a real other world. Deep in the mountains, the whispers of ancient darkness quietly revive... Fighting side by side, complaining to each other, hiding the sweet bond between childhood sweethearts but unable to recognize each other.