On June 14, 2022, Abarrientos decided to forego his remaining years of eligibility left to play for FEU.

He was then signed by Ulsan Hyundai Mobis Phoebus of the Korean Basketball League as an Asian player quota, becoming the second Filipino cager to do so after fellow Gilas player, SJ Belangel of Daegu KOGAS Pegasus.

[3] On March 30, 2023, Abarrientos was honored KBL Rookie of the Year, averaging 13.6 points, 2.7 triples, 4.8 assists, 2.9 rebounds, and 1.4 steals in 29.1 minutes over 51 games on his 2022–23 debut season.

[4] On June 30, 2023, Abarrientos mutually parted ways with team, thus terminating the remaining two years of his contract.

[6][7] On July 14, 2024, Abarrientos was selected by the Barangay Ginebra San Miguel as the third overall pick in the 2024 PBA Rookie Draft.