A drop of sunshine falls to the ground and grows into a magical flower, which has the power to heal injuries. An old woman named Godel found it and used it to sing a spell to stay young. Centuries later, the queen fell ill during childbirth, so this flower was found. She recovered and gave birth to a daughter. They named her Rapunzel, and her blonde hair is now the source of magic. Godel kidnapped Rapunzel, hid her in a high tower and raised her as his own child. Goth knew that if Rapunzel's hair was cut off, it would turn brown and lose its magic, so Rapunzel's hair was left behind. Every year, on Rapunzel's birthday, her kingdom will release thousands of sky lanterns, hoping that the missing princess will come back. On the eve of her eighteenth birthday, Rapunzel asked Godel to show her the floating lights, but Godel refused.

At the same time, a group of thieves, led by the charming Flynn rider, stole the crown of the missing princess from the castle. In the subsequent chase, a horse named Maximus separated from his rider, the captain of the guard, and continued to look for Flynn alone. Lin Chih sheng, his accomplices, took the crown; He abandoned them and stumbled upon Rapunzel's tower. Once inside the tower, Rapunzel knocked Flynn unconscious with a frying pan. She hid Flynn in her closet and confiscated the crown. When Godel came back, Rapunzel asked for a special pigment as a birthday present, which was made of white shells from distant beaches. Godel began a three-day journey to bring back shells. Rapunzel Flynn made a deal: a "journey of light" in exchange for the crown. Flynn tried to get Rapunzel to end their journey and take her to the comfortable Duckling Hotel, which was full of Gaul thugs, but the thugs were fascinated by Rapunzel, and she encouraged them to pursue their dreams.

Goth's mother saw that there was no rider in Maximus, and she was worried that someone would find Rapunzel. She returned to the tower and found Rapunzel gone. At the same time, the guards invaded the pub, but Rapunzel Flynn escaped. The chase ended at a dam and Maximus caused the dam to collapse; Flynn and Rapunzel are trapped in a flooded cave. Believing that he was going to die, Flynn admitted his real name: Eugene Fitzherbert. Rapunzel admits that she has magical hair that glows when she sings. Using her strength, they found a way out. Later, when Flynn went to collect firewood, Godel secretly met Rapunzel. Godel told Rapunzel that Flynn didn't care about her and just wanted the crown. Godel gave Rapunzel the crown and insisted that she give it to Flynn to test him.

The next morning, Maximus faced Flynn, but to Flynn's dismay, Rapunzel became friends. The three arrived in the kingdom, and Flynn took Rapunzel to see the lanterns that night. There, Rapunzel returned the crown to Flynn. Flynn found the Stubbing brothers and told Rapunzel to wait when he returned the crown to them. However, the two brothers tied him to a boat and took him across the lake. They exposed Flynn's "betrayal" to Rapunzel because they tried to kidnap her to gain the strength of her hair, but Godel "saved" her and they returned to the tower. Later, Flynn was arrested and sentenced to death. Maximus took the hotel thugs to rescue Flynn, and Maximus and Flynn ran back to the tower. From all the clues she found in her adventure, Rapunzel realized that she was a missing princess and tried to escape from the tower. When Flynn fled Maximus and returned to the tower, he climbed Rapunzel's hair, only to find that she was locked on the wall and gagged. Godel stabbed him in the back, prepared to take Rapunzel to a new hiding place, took one end of the chain off the wall and tried to pull her away. But Pascal, Rapunzel's pet chameleon, fought Godel. Rapunzel's mouth was blocked. She said that she would fight all the time, but promised that if Godel allowed her to cure Flynn, she would go with him willingly. Knowing that Rapunzel would keep her promise, Godel agreed, but before Rapunzel could cure him, Flynn cut her hair with a broken mirror. Rapunzel's hair turned brown and lost strength, and Godel began to age rapidly. Godel, who lost her way, hobbled around the tower when Pascal tripped her and fell off the tower. She turned to dust before landing.

Flynn died slowly in Rapunzel's arms. Broken-hearted, she cried and sang a spell with tears in her eyes. A tear, full of her strength, fell on his cheek and woke him up. The two embraced and kissed. Back in the kingdom, the members of the royal family reunited in tears. A few years later, Flynn married Rapunzel. Along the way, the Gaul mobs realized their personal dreams, and Maximus became a respected official in the Royal Guard.