Sunny is extremely shy and quiet. He rarely speaks and does not like to smile. However, despite not expressing it as clearly as the others, he still appears to care deeply for his friends. Sunny is described as a "really good listener" who does not mind listening to his friends vent. He is also stated to have a great memory.

After—something—changed his life four years ago, Sunny has not left his house once, living in his own reclusive bubble. Hoping for a fresh start for her son, his mother decides to move their family out of town. However, when his childhood friend Kel re-enters his life, Sunny finds himself thrust back into a world he once knew. With only three days before the move, the duo come across familiar faces as they go through town—reawakening a dark past that Sunny has tried so hard to forget.
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(Source: K Manga)