I'm not featured myself, but I've been interested in being featured for a few years now. I've amassed quite a lot of knowledge regarding the qualities Webtoon looks for in potential Originals by analyzing series that have been selected from the Canvas section.
Story
With Webtoon Original stories, they often look for comics that showcase a unique premise with a teenage-oriented demographic. Your story hits the mark for these two qualities, however it may be in danger of being too similar to their current lineup of comics. After reading through the story, it seems like a charming, shounen-esque action series with elements of romance and slice-of-life. I can see a lot of potential in the series, but I haven't encountered a particularly unique quality that sets your comic apart just yet. Having a diverse protagonist in a gay romance situation is quite new, but the execution feels similar to basic heterosexual romance comics such as Luff. If you could capitalize off of these two traits and showcase themes pertaining to gay love and interracial relationships more in your comic, you could really set your comic apart from the rest.
Episode 1: I thought the first episode was a decent introduction. I was curious as to why Cory and Emmet were on a plane. I thought the set up with Cory's family was a great introduction into their family dynamic. However, the extra addition with Isa meeting Cory at the end should occur before Cory meets Emmet in the street. Going from an interesting, mysterious event back to normalcy in one episode kind of ruins the tension. Overall, the episode made me want to click on the next episode.
Episodes 2-8: This is where the story teetered off a bit. There are many introductions to several different characters at once. This is not inherently a problem. The only issue with this is that I didn't understand how these characters advanced the story or contributed to the overarching goal. The introduction of Joy made it seem like she would have an impact on the overall story, but her contribution so far has been limited, making me question her relevancy to the story. Cory's group of friends seem more like a supporting cast for the sake of having a supporting cast, rather than a group of individuals who help him progress through the story. However, these are just my initial reactions and the story has hardly begun, so I may be wrong about the character's relevancy to the plot. I would advising focusing less on these characters and more on the main cast (Cory and Emmet) in the first 10 episodes, though.
Episodes 10-17: This is where the story picked up. I was curious about the monsters appearing every time Emmet and Cory meet. The occurrences were fun to read and the character's reactions were on point. I loved watching their relationship progress throughout these random meetings. The only complaint I have is the random "rewind" section that happened before the first monster occurrence. It felt like a bait-and-switch and was ultimately unnecessary in the grand scheme of things.
Art
This is the main issue between you and becoming a Webtoon Original. I don't want to sugarcoat things for you, so I apologize if I come off as rude, but your art is currently not up to par with Webtoon Original standards. While your writing is great, the art holds back the narrative tension and atmosphere you try to portray in your comic.
I'm short on time, so I wasn't able to make multiple examples, but the biggest issue that could be fixed easily is the lack of shadows. Shadows are immensely useful in creating atmosphere. A lot of your panels have soft, gradient shadows that lack confidence. Focusing more on hard shadows and vignettes can add a whole lot to your comic. Here's an example where I added basic shadows and a vignette in one of your panels:
Another big issue is the anatomy. I can clearly see that you put a lot of effort into posing your models and trying to capture the right angles in your panels, but your lack of anatomical knowledge shows quite a lot. The main character's faces are disproportional at times and the bodies lack proper muscle structure. The clothing lacks realistic wrinkles and folds, making the characters appear more cartoon-y than anime-inspired. I would suggest some basic tutorials on anatomy (learn the basic skeleton structure, then study the muscle structure, and finally focus on perspective in order to pose them correctly.) Doing a couple of quick gesture drawings every day is a fast and sure-fire way of understanding the human figure and will help boost your art immensely!
Backgrounds were also an issue for me. I found myself lost at times due to the lack of establishing panels. Make sure to showcase a panel of the school before delving into the characters talking in the cafeteria. Make sure to showcase a panel of Cory's house before showing him talking with his family. Little adjustments like these will improve your comic by a mile.
Most Webtoon Original artists use 3D models of backgrounds to quickly craft panels and avoid redrawing backgrounds. SketchUp is currently the most popular program of choice, but you have to pay a $700 dollar fee in order to use the program commercially. Even so, as long as you're not participating in the ad-revenue system or using a Patreon, you should be legally allowed to use the models without paying for the license. If you get signed on with Webtoon, they will offer some money that you can use to pay for the license so you can commercially use the program. Aside from that, try learning a bit of perspective (one point, two point, three point and fish-eye), it's surprisingly easy once you get the hang of it and it will help you ground your characters and background.
Conclusion
You have great potential in becoming a Webtoon Original this year. Your writing is on point and your art can really shine if you make a few adjustments. Please take these criticisms with a grain of salt, as I am an amateur myself and I don't know the full scope of your story. I love where your comic is going and I hope you continue to improve your craft so it can reach an even wider audience!