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The story of six university students facing new challenges like: studying hard, making new friends and enemies, and unexpectedly falling in love with the least likely person.

This sequel continues from where 2 Moons 2 left off and will show the progression of all three returning couples. Pha has to persevere in times of helplessness as Wayo's incriminating pictures and videos have been released by Park and Pring. The story will show the progression of their relationship after that scenario. Ming and Kit will have to learn to develop and mature in their relationship, while Forth and Beam will also settle down and progress in theirs. Two new couples are also being included. Their storylines are more along the "rival to lovers" sort of scenario. One of the pairs includes Suthee, the medicine moon.

Wayo is accepted to Kantaphat University in the Faculty of Sciences. There he reencounters Phana, a second-year boy he's long been in love with, though he had never managed to talk to him. When Wayo has the chance to become the “moon” of his faculty, the two are thrust together as Phana, himself the former “moon” of the medical faculty, must supervise the freshmen participating in the competition. Despite a scathing first encounter, the two slowly get closer and closer. Wayo gets to know Phana's friends, Beam and Kit; Kit who Ming, Wayo’s best friend, forms an unlikely bond with and who he begins to court despite Kit's initial distaste.