A text bubble. Jae-hyuk: "Good morning, girlfriend. Your cat just bit me." Seo-ah, smiling, types back: "Good morning, boyfriend. He likes you."

Jae-hyuk finds Seo-ah at the pojangmacha, sketching the empty chair across from her. He sits down. No soju. Just him. He says, "I'm terrified. Of losing myself. Of becoming someone's disappointment. But I'm more terrified of losing the person who saw my sad succulent and still replied." He takes a deep breath. "I want to define this. I want to be your boyfriend. I want to meet your cat properly. I want to stay the night and text you good morning until you block me." She laughs, tears in her eyes. "That's a lot of rules." "Let's break them all."

Ji-a asks Seo-ah, "So, what are you two?" Seo-ah panics. She corners Jae-hyuk in his car after a tense dinner where Do-jun flirted with her just to provoke Jae-hyuk. "We should define this," she says. Jae-hyuk freezes. His trauma surfaces. "I can't. I'll ruin it. I ruin everything good." He drives away. She cries in the pojangmacha alone. Arc 3: The Definition (Chapters 41-50) Chapter 41: The Grand Gesture (Gone Wrong). Seo-ah decides to end it. She writes him a letter: "I'd rather have no relationship than a half-defined one." Jae-hyuk, panicking, shows up at her studio with... a new succulent. "For your desk," he mumbles. She slams the door. Doongie hisses at him through the window.

Do-jun transfers back to the hospital. He sees Jae-hyuk laughing at his phone (Seo-ah's meme of Doongie in a tiny doctor's coat). Jealousy ignited. Do-jun starts "just happening" to join Jae-hyuk's lunches, subtly undermining Seo-ah: "She seems... messy. Not your usual type, Jae."