Oh Ah-rin debuted in the entertainment industry in 2015 through a commercial advertisement for a food company. In 2017, she landed a supporting role in the SBS series Band of Sisters, which gave her a Youth Acting Award nomination at the SBS Drama Awards. She then made a special appearance in the tvN fantasy romance drama Hwayugi. In 2018, she was nominated for another Youth Acting Award at the SBS Drama Awards for her work in An Empress’s Dignity. In 2019, she appeared in tvN’s Melting Me Softly and in SBS’s VIP.  In 2021, she became part of the KBS2 sageuk River Where the Moon Rises.