She has obviously put on some efforts but the drama is going to face some stiff competition being aired at the same time as Legend of the blue sea which is almost a guaranteed hit,I wish them all the lucky in the world.

Best of luck to this drama it's against JJH and LMH......I do commend her for trying though. She's made a living off of her figure and hair and it's not easy to give it up. Fighting!!!

I like Lee Sung-kyung, and I'm glad that she's putting in effort for this role even though she still seems a little miscast. I still can't stand Nam Joo-hyuk, though - I guess when you play despicable characters, you yourself become despicable by association.

I wish I can transfer my weight to her lol.

But she looks good with this transformation. Wish she has better partner as Nam Joo Hyuk still has a very long way to go. I hope this still get decent rating to go against JJH's new drama. It won't be easy but heyy let's try be positive ;)

Her dedication to the role is admirable. If I did not hear wrongly, she has gained nearly 10kg !!!
10kg is a lot for her who has very skinny body type .
It's very hard for the skinny person to gain weight even though they could eat plenty.
I can't imagine how difficult for her to eat days and nights to increase her weight and practice weightlifting for this role.
She chopped her hair off for this role. That long gorgeous hair that she keep for years.
I really hope that everyone will look at her with a positive eyes and open heart.
And I think this role will suit her a lot since her personality in real life is really down to earth, sweet and adorable.
It will continue to expanding her challenge of different types of roles.
Look at that smile! She is too cute right?

The timing of the premiere of this drama is like suicide. So unfortunate really.Same day as the hugely anticipated drama Legend of the Blue Sea.

Since it's her first leading role and it is written by the creator of Oh My Ghostess.

Thus I am wishing this drama the best luck.

Who knows it might get double rating and have its own fanbase ^^?

Well, no one can say Lee Sung-kyung doesn't commit to a role.

I admired how she went with the full eyerolling crazy in Cheese in the Trap without a care for her image - now I hope she'll be able to pull off playing a sweeter character.

(and even an ugly haircut can't cover the fact that she is drop dead gorgeous - aura-wise, she reminds me weirdly of Jeon Ji-hyun. Which is ironic considering her drama is going up against JJH's in the time slot!)

She has played the hard-working girl next door before in Flower of the Queen. Although that show was ridiculous and painful to watch, she really did well. I wish her luck, this is an uneven battle of Ant vs. Elephant but who knows if it's all made its possible to attract a decent number of dedicated audience. Good luck to the team.

Major props to LSK for her commitment to her characters. It reminds me of when Go Ara cut her hair and intentionally gained weight for Reply 1994 and how it paid off for her. I am now putting this drama in my must watch list after seeing these stills.

She's adorable! I love that she seemed to put a lot of effort to fit the role.

It's a given that the simple, cheerful, kind hearted heroine always sports this kind of hairstyle, short and straight with bangs. Nothing fancy, and curls are a no-no: they hint at a dark and twisted side. Laurel Tree Tailors, Beautiful Gong Shim, BoF....the list goes on. Oh, and the bike, too - that's another given.

Oh I am rooting for her! I've always liked her since she debuted with Its Okay It's Love and I hope that this drama is successful despite its stiff competition.

Fingers crossed. Gotta watch this.

"Jo Soo-hyang (Who Are You–School 2015) as a rival gymnast"

Ya mean, maybe reprising her role as Satan? One of the best villains ever. Forget the main leads, I'm tuning in to see if she still has that magic touch.

Not specific to this show ... but i get a little annoyed when the role actually demands that the actor be heavy and instead of casting an appropriate body type they have a super thin actor put on weight or fat suit... and then lose it rapidly in like a month and splash it across fashion magazines.

Any entertainment industry is so negative to diversity in sizes. Actors are told to be super thin to be successful
but when a role comes around that is about a specific body type - why not give it to an actor who fits the role ? They are already to short changed. Also Sends a more body positive msg to teenagers ..

I like her a lot and I am already warming up to this new drama, she looks funny! :) I have seen less of NJH, but I like his character in Scarlet Heart too. Anyway, I wish them the best and hope this is a success :D

I want to believe OP and the comments here, but it still looks to me that yes, she gained some weight (her face), but she is also wearing baggy clothes. and her hair really looks like a wig to me.

hope I'm wrong tho. I like her and think she has a good future as an actress.

While I wasn't interested in the casting or the storyline. Kudos to her for picking a different project and challenging herself. Extra points for trying to suit the character. But other than putting weight I thk it needs her to go on rigorous exercise to have built and toned arms?

I love Lee Sungkyung but not so much of Nam Joohyuk. I wish them all the best though.

She looks good in her new avatar.

I am waiting to see her in a very cheerful, hardworking, warm , sweet, yet badass character. I am fed up with the mean, arrogant , lonely type characters she played.

Behind the camera, she really has that sparkling cheerful personality. Her smile is so contagious. I watched Running Man, and instantly i LOVED her. She outshone, Park Shin hye in that RM episode.