Episode 4 recap: Song Yao took Ji Chengchuan back to their hometown.

Ji Chengchuan felt that he needed to make some changes to impress Song Yao, while Song Yao believed that he needed to be patient and gradually gain Ji Chengchuan's trust. To prevent Ji Chengchuan from seeing certain information, Song Yao quickly messaged Gu Zi Jun. However, Gu Zi Jun was busy playing games and didn't have time to check Song Yao's message. With Song Yao's urgent texts, Gu Zi Jun finally saw the WeChat message and hurriedly tidied up when he learned that Ji Chengchuan was coming to their house.

At the door, Song Yao was worried that Gu Zi Jun hadn't seen the message and wasn't packing up. Song Yao made excuses to prevent Ji Chengchuan from entering. However, Ji Chengchuan pretended not to notice and Song Yao had no choice but to bring him inside. Upon entering, they saw that the house was clean, which relieved Song Yao a bit.

Song Yao asked Ji Chengchuan to look at the flowers while quickly instructing Gu Zi Jun to hide by the window. Ji Chengchuan seemed curious about something he had noticed, so Song Yao pretended to have a headache to divert his attention. Gu Zi Jun accidentally fell and let out a scream. Song Yao saw that Ji Chengchuan wanted to investigate, so she hurriedly explained that there was a stray cat nearby that always made a mess at this time, and there was no need to pay attention to it.

Gu Zi Jun saw his clothes hanging on the window and quickly slipped away to the store. Song Ling Ren noticed that Gu Zi Jun was with Song Yao's sidekick, Gu Zi Jun, who was naked, so he instructed Jiang Nan Xuan to follow Ji Chengchuan while he went to see what Gu Zi Jun was up to.

Gu Zi Jun found it strange that this woman's behavior of buying flowers was a bit odd. Song Yao wanted Ji Chengchuan to leave, but Ji Chengchuan pretended not to hear Song Yao's intention to send him off, as he wanted to find that necklace. Song Ling Ren and Gu Zi Jun both felt a little awkward, and Gu Zi Jun thought Song Ling Ren was simply a pervert.

Jiang Nan Xuan saw Shen Shuang Shuang returning and was afraid that it would ruin Ji Chengchuan's good fortune, so he deliberately bumped into Shen Shuang Shuang. Shen Shuang Shuang felt angry and wanted to kill Shen Shuang Shuang for trying to bribe her with money.

Jiang Nan Xuan was beaten up by Shen Shuang Shuang, and something unbelievable happened between Song Ling Ren and Gu Zi Jun. Gu Zi Jun felt like he had been struck by Cupid's arrow. Shen Shuang Shuang was furious about the man she had encountered.

Song Ling Ren reluctantly threw away the flowers that Gu Zi Jun had given him.

Shen Shuang Shuang urged Song Yao to quickly complete the task, and Ji Chengchuan also knew that he only had one day left. Song Yao and Ji Chengchuan started playing mind games again and returned to the place where they spent their childhood.

Sheng Si Lin also arrived, and both Song Yao and Ji Chengchuan were thinking about how Sheng Si Lin's presence would affect their mission. They wanted to get rid of him. Sheng Si Lin didn't have money to take a boat, so he mistakenly boarded a different boat after making a phone call to his brother. Song Yao took Ji Chengchuan to reminisce about their childhood, hoping to make him relax his guard and complete the task of finding the necklace more quickly.

What Song Yao didn't expect was that Ji Chengchuan also had the same idea of wanting to obtain the necklace. Song Yao took Ji Chengchuan to their favorite childhood island, climbed to the top of the tower, and told him amusing stories from their childhood. Ji Chengchuan looked at Song Yao, who seemed to be radiating light, and felt that she was different from before, stirring something in his heart.

Jiang Nan Xuan sent a text message urging Ji Chengchuan to quickly handle Song Yao, as there were only two hours left until the last ferry. If they didn't make good use of their time, it would be too late. Song Yao told Ji Chengchuan that she used to be very afraid as a child, but whenever the lighthouse's light shone into their home, she felt safe. Song Yao glanced at Ji Chengchuan, hiding something.

Song Yao took Ji Chengchuan to her house, claiming that she had left something there and brought him inside to retrieve it. Song Yao took out a doll with a bell hanging around its neck, and on it was a private seal with the words "Lin Shu." This doll held special memories for Song Yao, reminding her of how helpless she felt when her mother had an accident and the hospital called.

Ji Chengchuan told Jiang Nan Xuan and the others to go ahead and that he would catch the early ferry home the next day. Jiang Nan Xuan thought Ji Chengchuan was crazy and had no idea what he was doing. Ji Chengchuan believed that he wasn't crazy and that he would uncover the truth of the past and take responsibility accordingly.

However, as he looked at Song Yao beside him, Ji Chengchuan's gaze became complex.