At first, I didn't have high expectation looking at the actors in this drama. But it's a very short episode, you can finish it in 1 day.. I try to watch and surprisingly I love the story and the acting.

Both ML & FL are charming. I love how FL seems arrogant and domineering from the outside, but the more you see her, the more you know that she is so lonely and soft.

After knowing what she's been through I can understand why she become that way.

I love the ML the most. He looks cute, but actually very mature and dependable.
The way ML & FL gradually fall in love to each other is very natural... and I feel it's so romantic and adorable. Both ML & FL's profession are totally different yet can be connected. Jewelry and Flower.. what an interesting combination.

I love the office story side as well.. it's not too heavy, but we learn about friendship and loyalty through all the FL's subordinates.

This drama also bring another story about love-hate relationship between brother and sister.. but it's totally make sense.

I'm a bit confuse with the extra ending.
But here I share my assumption.

Since the ML's background is a very kind and warmhearted guy, I feel he is being chosen as an experiment subject by certain party to go to parralel universe or another dimension and meet the FL. That's why he become the main character that has some power to make "changes" in everyone's life, especially FL through his kindness and flowers.

Without realizing it, they have a mission to make the FL heart beat become "zero", that later on we know it can be happen when FL can solve all the misunderstanding with her brother and her father, also at the sametime to find her true love.
The higher or faster heart beat here means the bigger problem that stimulate FL mind to lose control and at some point the more harder for her to come back and wake up in reality.
That way.. the ML has been sent to meet her there so she can dealing with her issues. No wonder only ML has such power to make FL calm and heartbeat can be slowing down.

I just can say the extra ending was made the whole fantasy story to be more realistic. Since we finally know why the FL can has a unique power to see her heartbeat rate.

Well, it's a parallel universe... every impossible can possibly happen. No wonder she is not a normal human there. However, the whole experiment are using both ML & FL's background and memory, that's why they can still remember each other after when they wake up from the "dream". The heartbeat rate become "zero" is like a sign for "mission completed", and the end of the story for both of them in the parallel universe (dream), to make the story over and going back to reality. I guess it's an experiment about "finding love" or "matchmaking project". We will see if there is second season of the story that probably will explain it to all of us.

After all... the drama title conclude the whole story. "The Only You in My World", means the main characters (both FL & ML) that actually still remain to love each other no matter is just happening in a dream or reality.

I don't think the extra ending is not necessary thou since the genre of this drama is fantasy.
But well.. overall I like the story. It successfully teach us about the meaning of love, friendship and family. It was sweet and funny as well!

P.S. Because of this drama, I will be more appreciate flowers and plants starting from now :D