Ohgong’s wardrobe of fur coats and his shift to woolen coats weren’t accidental. (Note all pics are from Dramabeans site, except for one. That site has nice pictures.)

In the beginning, he wore fur coats. To me, these served to emphasize his personality trait, that he was a monkey at heart. In the same way that a monkey is lively, impulsive and uncontrollable, OhGong behaved impetuously.  He attended to his physical and emotional needs without sparing much thought to the people around him or taking into account the consequences of his actions. He was a creature of nature who focused on his own self first. He did as he pleased (i.e., parking style) and took what he wanted (i.e., the liquor) . He would saunter across the street in a shaggy fur coat, looking like a pimp or a yeti.

Take Episode 1 for instance. He knew the child SunMi was going to be punished for freeing him, but he didn’t care. He left her there all the same. Sunni was the victim of his monkey business or dishonest trickery.
Credit: Dramabeans
Then, when he met her 25 years later, he displayed no visible remorse for fleeing from her and letting her face the music alone. He still possessed that cheeky, devil-may-care image and taunted her with the “fan” motion.
Credit: Dramabeans

In Episode 2, once he found out that she was SamJang reincarnated, he pestered her to allow him to eat her up. His only concern was regaining his god status so he could go to heaven and drink again. He had no qualms about killing her and eating her up. He even cruelly pointed out that she had a miserable life without any family, friend and lover.credit: Dramabeans

When he returned from being trapped inside the painting, his anger at being tricked to wear the Geumganggo displayed his devious monkey nature in full force. He wasn’t a monkey to mess around with.

Credit: Dramabeans

In Episode 3, he boasted that he didn’t feel physical pain whatsoever yet he grabbed SunMi’s muffler because he felt cold, leaving her to shiver in the cold. He returned it to her under pain of death Geumganggo.

Credit: Dramabeans

He tried so many ways to convince her to release him from the bonds of wristlet, using kisses, seduction, cheesiness, and the grandma’s memorial. But there was no way that SunMi would be deceived by him again. Monkeys would fly out of her butt first. Credit: Dramabeans

It infuriated this big monkey so much that he was willing to sacrifice an innocent life, Sunmi’s assistant, in exchange for his freedom. While it was always clear how inhuman he could be (duh he was a monkey by nature), both OhGong and SunMi underestimated the power of the GGG over him.

Credit: Dramabeans

In Episode 4, he deliberately crushed her heart here with this asshat of a confession. He behaved beastly but could we blame his monkey heart for resenting the forced enslavement and forced love he found himself in? Credit: Dramabeans

Then, on New Year’s Eve, when she implored him to protect her as Samjang AND he answered her solemnly and intently for the first time ever, he finally wore an overcoat like a normal human being. (Perhaps it was because he was summoned while he was checking his liqueur.) He promised her that he would protect her, “even if the world breaks.”

Credit: Dramabeans

In Episode 5, he was back to his normal fur and animal prints. It was as if his solemn vow to protect her never happened.  This was most likely because he viewed his promise as obligatory. It didn’t move him to get to know SunMi as a person with specific likes (i.e., strawberry ice cream) and tastes (i.e., music and movies). He was doing it because of the GGG.

Wearing animal prints to show his wild side 😜

Credit: Dramabeans

He looked mightily pleased when she called him “Our” OhGong and he looked really smug when she refused to let him join her in the movie film in case he became entrapped in the film again.

Credit: Dramabeans

As it turned out, he rescued her from death inside the movie by burning the whole reel. lol. His fur coat would have been stood out in the 1940s but he wore an animal print  accessory.

Credit: Dramabeans

But by Episode 6, he was slowly changing. He was still wearing fur coats but the fur became less conspicuous, and more like trimming. To me this signaled the shift in his character — from being a unreliable, self-absorbed and headstrong monkey to a more sensitive creature.

In a nutshell:

He didn’t want to share his red topcoat but relented and gave her his fur coat.

Credit: Dramabeans

Up to no good again and using SunMi as bait to settle accounts with Mawang.

Credit: Dramabeans

Feeling guilty about killing her off so tried to humor her with cotton candy. I like this fur coat best; it looked buttery-soft — like his smooth-talking.

Credit: Dramabeans

He was beginning to understand the gravity of his “prank” and felt terrible for putting her in harm’s way. His time being a cheeky monkey had come to an end when he empathized and saw how hurt she was.

Credit: Dramabeans

By the end of Episode 6, he was ready to admit that he found her pretty. His monkey suit was gone. Credit: Dramabeans

Episode 7 was the beginning of his HUMANization. He no longer wore eccentric fur coats. His sartorial style was in full display.

First, he wore a down jacket. He was feeling under the weather, which in Hong sisters’ romcoms   means he was ❤️ lovesick. Yet, sick as he was, he visited SunMi’s home unannounced to give her some of his porridge because SHE might be sick.

Credit: Dramabeans

Then, while in the library together, he moped like a lovesick Little Mermaid.

Credit:  Dramabeans or somebody’s tumblr

But he gave up his well-earned mermaid tears to SunMi so she could enjoy a virtual night with her beloved grandma while he feasted on … water.

Credit: dramabeans

See his coat? And his other coats in  Episode 8?

His coats evolved in the context of the story and the story arc of his character. His outerwear underscored the state of his inner self. When he behaved like a monkey, he was covered in fur. Now that he’s becoming vulnerable like a human, and soulful around SunMi, he wears his heart on his sleeves. Woolen sleeves, that is.