"It's Okay To Not Be Okay" captured the hearts of many not only in Korea but also in other parts of the world. It has also been a part of Netflix's Top 10 Most Popular Shows in several countries. Not only does the series talk about mental illness, but it also talks about how one person can change because of the love they receive and give. It also teaches people that in order to make others happy, you have to find that happiness within you first. The kind of joy that is not attained from material things. That is true happiness.

During the behind-the-scenes of the recent family photo that featured the three main leads - Kim Soo Hyun, Seo Ye Ji, and Oh Jung Se - many were amazed by how well the three looked.

Kim Soo Hyun looked like a model with his excellent body physique. It's no wonder that he could pull any look even casually, as a caregiver, and most especially a formal executive look.

Additionally, Seo Yi Ji seems to be an expert when it comes to photoshoots. It looks like she was born for the camera. Lastly, Oh Jung Se's poses were spectacular; he represented everyone with autism spectrum disorder.

Just by watching the clip, the ambiance was full of energy. Although there were several scenes wherein the three got goofy with each other, especially off-camera, they still managed to make a perfect scene that touched everyone's hearts.

Kudos to the crew behind the camera that made this series such a great one. Kim Soo Hyun brought to life Gang Tae's character, and his expertise of the craft manifested in each scene. Likewise, Seo Ye Ji's acting in this series is truly her break-out role.

Knowing that both of them are signed under the label Gold Medalist, a privately held multinational entertainment group and talent agency, who knows what other projects the two will star in together.

Going back to the clip, Kim Soo Hyun is very particular with his angles and he keeps on checking them. What a professional actor! He really wants each scene to be perfect!

The closeness between the three actors can't also be left unnoticed. It was even caught-on-camera that while he was doing a scene, Seo Ye Ji and Oh Jung Se were silently laughing from closeby.

In one particular scene, Seo Ye Ji can be seen shouting while rehearsing inside the library, and Kim Soo Hyun who was behind the camera made a sign to make her silent, which made her confused. The actress wondered if she made a mistake, then Kim said: "Because we are in the library." How funny!

In the next scene, where the brothers are watching together with a cartoon, the two were improvising their lines making their scripts.

The last scene was in the study room of the mansion. Even while the two are rehearsing their scenes, you just can't deny their chemistry. They even finished the clip with a cute ending.

Considering this is Kim Soo Hyun's first major role since his discharge, what will this CF star bring in the table after this drama series? We hope to see more of Kim So Hyun. Many are also sad knowing the drama series is down to its final episodes.

Watch the full behind-the-scenes clip below: