I think this drama has a little bit of potential from the beginning, since it gets you entertained by each scenarios that the story has. But where in fact this drama was a sci-fi, seems interesting and sometimes circulating questions ponders in your head of how he was inside that phone (seems weird, right? :'D). The drama seems to be good, but mixed with reality of dreams and pursuing your goals in life, with unexpected outcomes, bursts with emotions and feelings that I could relate to. With this, I think this drama seems to be okay with me, but I would go through with each parts of why this drama was interesting and entertaining to begin with.

STORY/PLOT
Kim Sun Jo was one of the CEO of the country's largest IT companies in SK, he was a genius as every life plans where planned well, but with challenges left to solve and take that brings him down. Due to its accident that causes his life to twist around in a wrong direction, he became a victims from an unknown killer by a senseless murder. But as he was still in a coma, his spirit was entered in his very own invented smartphone where he got trapped spent his life inside the CPU. Until, a university graduate student who's dream was to be an actor, Park In sung, found out a phone near in his neighborhood and as Sun Jo asked for help to In sung. As he take the advantage to save him, and willing to do the favor of Sun Jo in exchanging for his services. As In Sung entered the company acting as the President/CEO, there he met Sun Jo's secretary Jung Se Yeon. As they are together to solve the case and the truth about where and how did Sun Jo entered to a different dimension.
With this plot when I read everything, I get the point why it seems interesting that the fact that this was sci-fi, and how everything might goes without getting spoiled. When watching, it was very interesting, I think most of the parts of every episodes makes me want to never stop watching it because of how it gets even more interesting and exciting at the same time. With the plot as well, it blends so much with a little bit of romance, even if it focuses more about the comedy and mystery of this drama. But again, the story seems to be well, but then the endings needs to be fixed. I think it would have a better ending then what it was shown to make the story has a better one, with no flaws or I considered it as a good one. I also love how the story really explains how the sad truth gets hidden by how it is covered by people's words and decisions. Sometimes we chose what is better for us or for them, but we don't think of how hidden truths might give us an impact.

CINEMATOGRAPHY AND OST
So with this part, I really REALLY love the OSTS!! every ending scenes of each episodes gives me the thrill when it hooks me in every ending! It really blends every scenes, that make my soul cry, and how it gives reflection to the scenes and the characters feelings during that specific scenes to give atmosphere. The cinematography of this drama was a meh okay for me. There are some scenes that are pretty obvious that the blue cgi was kinda obvious.

CAST AND CHARACTERS
Chae Jong Hyeop, gosh he had lots of potential, especially he got so famous by his character so called "the potato boi" from a famous kdrama nevertheless,, I really like his role, the way he smiles lightens the mood, and nothing really changed his career from the previous projects he had, but for sure I could see lots of improvements, from the sad scenes and such. With his character, Park In Sung was never a disappointment for me, In Sung made his life so much twists that he never expected to involve in a case where he acted to be the CEO without any experience or degree. Park Sung Woong, it was my first time to see him ever since I watched kdramas. I like his role, but sadly I can't see a lot of his acting skills because most of the time, he was only a voice actor. But in his character, Kim Sun Joo was the same with Park In Sung, but the fact where his decisions where never been easy especially as a CEO. Love the way he blends with the other characters as well. Seo Eun Soo, was also the first time I saw here ever since the day I started to watch kdramas. She was pretty good at acting, but before I could really describe her, same as Park Sung Woong, I need to discover both their other projects that are different from their roles in this drama. Well Seo Eun Soo was pretty tbh! I could really see how she fits so well with her role as a secretary. With her character as Jung Se Yeon, I think it was never been easy for her to be part and getting involved by SunJoo's case because she also has personal matters in her private life. Thanks to her boss, she could provide what she needs in her life. But again, the other casts did so well! I appreciate their efforts in being part of this drama, kudos to the team <33

Overall, it was a fun and a good watch during weekends. Especially it only has 12 episodes, i think viewers would get satisfies with how it goes, just like me hehe.
Good for binge watch (since it is a 12 eps kdrama, i think its enough to kill the allotted free time), good for time kill, great for beginners and good for re watch as well.
Well here I am, as I end the note, hoping that the casts would have other roles to enter in their future careers, hoping that they could strive higher recognitions as well! a good kdrama, and again, kudos to the team, rooting for them!! :>