Excitement? The Unstoppable Flutter!

S1, E3: [Excitement? The unstoppable flutter!] Woo Hyun falls into the pool and he can't stand up due to his fear of water. Seul Bi and Sung Yeol jumps in to save Woo Hyun. Seul Bi becomes a student at Woo Hyun's school and she struggles to find Woo Hyun's lost necklace.