SEOUL, Jan 22 (Reuters) - While the second season of

"Squid Game" has new plot twists, one element of the Netflix ( NFLX )

mega-hit series where contestants down on their luck risk their

lives to play children's games for the chance of winning cash

prizes, has remained constant.

That is Young-hee, an innocent-looking robotic doll who in

fact has a deadly role in the South Korean-made television

series to find contestants to gun down playing the game "Red

Light, Green Light" if she spots them moving.

Young-hee, who is clad in a simple orange dress and a hair

clip, has become a viral meme on social media and the

centrepiece of the streaming giant's promotional campaign.

Chae Kyoung-sun, the production designer for "Squid Game",

said the doll's appearance had been partly inspired by her own

daughter.

"My daughter had a bowl cut for a long time which was very

cute so I decided to draw a very short bang," Chae told Reuters.

"Her eyes are a little crazy. She's a killing machine and

the movement of her eyes had to be easy to see, so we made her

eyes quite big."

The initial inspiration for Young-hee came from a girl of

the same name on the cover of old primary school textbooks in

South Korea, though the killer doll was initially conceived as

genderless, Chae said.

The first season of "Squid Game" became the most-watched

show on the streaming platform and expectations were high for

the second season to replicate the success.

The new season of the dystopian thriller, released on Dec.

26, also broke a record as the most-watched show in its premiere

week on the streaming platform, with 68 million views, according

to Netflix ( NFLX ).

The streaming giant said on Tuesday it gained a record 18.9

million subscribers in its fourth quarter thanks in part to the

second season of Squid Game.

In 2023, Netflix ( NFLX ) announced a $2.5 billion investment in

South Korea to produce Korean TV series, movies and unscripted

shows.

Asked about the success of the show and this particular

character, Chae put it down to their unorthodox nature.

"How does this cute kid suddenly turn into a killing

machine? - I think the creation of the 'Squid Game' world by

adopting unpredictable concepts and methods resonated with young

people looking for fresh things," she said.

At the end of the second season, viewers also get a glimpse

of Chul-su, a male doll set to appear in the next season

alongside Young-hee that was originally envisaged for the first

series.

"When they said there will be a second season and that

Chul-su would appear, I brought back the drawings I had of

Chul-su for the first season," Chae said.

"Think of it as a friend, a partner," she said.

The third and final season of Squid Game is set to be

released later this year.

(Reporting by Hyunsu Yim and Minwoo Park; Editing by Ed Davies

and Ros Russell)