"First Acquaintance with You" tells the story of the spiritual master Ji Yunhe and the shark who are determined to break through the shackles, go through many difficulties and dangers, and finally get married, and work together to protect the common people.

Princess Juwu of Shunde hunted a shark and wanted to find someone to tame it. The princess has three wishes. First, she wishes that the demon can speak human words. Second, she wishes that the demon's tail can turn into legs. Third, she wishes that her heart will never be rebellious.

Everyone knows that the Eastern Demon Control Island, the Western Demon Control Mountain, the Southern Demon Control Valley and the Northern Demon Control Platform are the only four places in the world that allow people with the ability to control demons to survive. The Demon Controlling Valley in the south is where the most powerful demon control masters are in the world. She is the most powerful demon master in the Demon Control Valley, but she is obsessed with a mermaid.

This time, Ren Jialun appeared in "First Acquaintance with You" as a mermaid. He is completely different from his previous costume image. He has the courage to challenge himself and constantly portrays different roles. He plays a character in "With You" A "little milk fish" with a pure mind, ignorance and sincerity.

His delicate and superb acting skills inject soul into the role of Chang Yi. Especially in the first three episodes, he relied solely on his acting skills to maintain his innocent and cute image with almost zero lines.

The audience who were attracted by him were captivated by the "milky fish" Chang Yi in his eyes. The eight-year-old Naipai Chang Yi in Hengtiao Lu also became adorable. The audience made people say "I really want to have a long life".