We see the young character move from South Wales to London during the 1980s, making new friends and enjoying the lifestyle that comes with living in a big city.
Played by Callum Scott Howells, Colin’s innocence and finding joy in the every day things in life is what made us all warm to him immediately.
Spoilers are ahead for episode three of It’s A Sin, so you have been warned! It’s the mid-series shock when we learn that Colin has acquired the HIV virus and he starts to suffer from AIDS-related illnesses.
It ultimately leads to his tragic death at the end of episode three, where the audience are left wondering how Colin acquired the virus as he seemingly hadn’t had any love interests in the show.