In the heart of Seoul, shy college student Jae-won has never been in love—until he meets the charismatic and free-spirited transfer student, Min-hyuk. When Jae-won stumbles upon an old, handwritten 'first love manual' left by his late grandmother, he decides to use its outdated advice to navigate his confusing feelings. From awkward coffee dates to disastrous confession attempts, the manual leads to a series of hilarious misunderstandings and tender moments. But as Jae-won learns that love can't be scripted, he realizes the real connection with Min-hyuk is worth more than any guide. The First Love Manual is a heartwarming Korean BL that celebrates the messy, beautiful journey of falling in love for the first time, wrapped in charming performances and genuine chemistry between the leads.