Squid Game is the latest addictive Netflix offering to hook fans into binge-watching hour after hour of the somewhat disturbing series.
It follows 456 people who have been handpicked to compete in a series of innocent-looking childhood games in a bid to become hugely wealthy and write off their spiralling debts - with deadly consequences for the losers.
Seong Gi-hun is one of those who is tempted in by the opportunity of finding his fortune as loan sharks circle, with episode one showing him to be Player 456 - the last to have joined the game.
Right from the start, he gravitates towards Player 001, an elderly man who reveals doctors have told him he has a tumour in his head - but a fan theory has suggested there's more to their relationship than meets the eye.
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TikTok user Ruthbellpan discussed the theory that Player 001 and Gi-hun are actually father and son, pointing out a few moments between them that hint there's a deeper connection.
She says that the elderly man tells Gi-hun his son was "just like him" and that in one game both characters say they once lived in a neighbourhood that looks just like the false set created for the challenge.
But perhaps most convincingly, she says: "When the old man lost his memory and asks 'What's the date today? Is it the 24th?' He says it's because his son's birthday is coming up."
When Gi-hun tried to guess his mum's pin number at the start of the first episode, he tried his birthday, entering 0426 - or April 26 - which could align with the date of his son's birthday.
She says Player 001 created the game to find his son and will now want Gi-hun to continue the tradition, citing their numbers as the first and last in the game as further proof.
The clip has racked up a staggering 15.2 million views and more than 42,000 comments, as one person replied to say: "OMG YES THAT'S WHY BEFORE YOU CAN ENTER THE GAME THEY'RE ASKING THE NAME AND BIRTHDAY."
A second said: "At first I thought this was going to be a reach, but it's kinda convincing."
But others think they spotted a flaw in theory, arguing that Gi-hun later states that his birthday is October 31.
What do you think? Let us know in the comments.
