Oh, man. So the Scheduler/Yi-soo finally remembers Yi-kyung, and rips our hearts out in the process. His pain is palpable as he takes in her haggard face and asks, "Why do you look like this? What have you done to yourself?" Ji-hyun is unnerved and reminds him that she's Ji-hyun, which takes him out of his memory.
Yi-soo wonders at the photo found in Yi-kyung's hotel locker, because he's never seen it before. It makes one puzzle piece fall into place for him, and he breaks down sobbing, realizing, "So that's why Yi-kyung..."
A flashback gives us a rounder picture of their argument: Yi-kyung had broached a topic they'd argued about many times before, only today she's clutching the photo in her hands (he doesn't see it). She'd accepted that he moved out into his studio to pursue music, but now suspects he's using music as an excuse to cover up for a new girlfriend, while he hears her words as nagging mistrust when he'd repeatedly told her that he's not fooling around.
Finally, Yi-soo had declared, "I'm sick of it! I'm sick of you. The thought of marrying you feels suffocating! Thinking of spending the next 30, 40 years with you like I've spent the last 18 - it's horrifying."
Oh, Scheduler. How could you? He'd yelled, "How is it you never change? How can you be exactly the same as you were at age 5?"
After that blowup, he'd headed away for a few weeks to perform with the band, working construction in the daytime. His pissiness eventually faded and he'd bought a set of couple rings, which he had engraved, "S love K." It's the same thing printed on his bike, which means, Yi-Soo loves Yi-Kyung.
On his way back to Seoul, like a lovesick fool he'd been looking at the rings while riding his bike, thinking of their reconciliation. Only, well, we already know the story. One collision with a truck later and he'd been twitching on the ground, looking at his rings and flashing back to all the happy times in his final moments. Oh my god, this is so sad. Can't see my screen. Need a tissue.
So what about that photo? Yi-soo realizes that the girl had taken it while he slept, and wants to explain himself to Yi-kyung right away. Except...something feels weird. Why did he recover his memory? (As in, why was he allowed to retrieve it?)
He calls his reaper sunbae to ask angrily how he could've let Yi-kyung live like this for five years, and what he gets in response is a shrill ringing tone - a summons. With that, he sends Ji-hyun away, and I love that his send-off - the very common, everyday "take care" - is extra meaningful today, since it literally means, "Take care of your body."
On her way home, Ji-hyun wonders if there's such a thing as truth that can't be misunderstood. She had loved her best friend, but In-jung said she'd been blissfully ignorant. Yi-soo called his feelings love, but Yi-kyung believed he'd changed his mind. "How can you convey feelings that aren't seen?"
In-jung turns to a shaman for advice, which cracks me up for some reason although I suppose it should make sense within this drama's scope. At least, more than incompetent psychiatrists who make diagnoses about past lives and have no understanding of doctor-patient confidentiality.
The shaman returns bad news, saying that In-jung's stuck in a bind, all right. But at least the girl didn't really die, because she'd have haunted her forever then. The only way for her to fix this is to chuck the soul out of her host body. But how?
At Heaven, the ridiculous lovebirds (Manager Oh and his wife) have a spat, because wifey is frustrated with her husband's refusal to tell her what he's talking about with Kang that is so secretive. She's been nagging for a while, but he has put his foot down, and now she feels their marital trust is threatened. Finally she walks away and he breaks down, saying that he has an important reason for doing it, and that he's just as miserable.