When did Kenneth Ma and Jiang Meiyi fall in love?

In episode 3 1, Jia Jun wanted to invite Jia Rui to go on a date in Taiwan Province, but Jia Rui had already made an appointment with Zhihong to travel to Kenting, so they secretly left the hotel to avoid Jia Jun. When Jia Rui and Hong Zhi enjoyed the sunny beach in Kenting while drinking, they both realized that everyone wanted to pursue an irresponsible and exciting relationship, so they asked each other what they wanted from the other half. After that, they went back to their hotel rooms, but they still missed each other very much and even had a close relationship.