On October 8, 2022, Go faced Lee Dae-ho of the Lotte Giants in his final professional game. In the contest, Lee appeared as a pitcher, and got Go to ground out to him on a comebacker to the mound.
On January 3, 2024, Go signed a two-year, $4.5 million contract with the San Diego Padres. He was optioned to the Double–A San Antonio Missions to begin the 2024 season. In 10 appearances for the Missions, Go logged an 0–2 record and 4.38 ERA with 15 strikeouts and one save across 12+1⁄3 innings pitched.
Go split the 2025 season between the rookie-level Florida Complex League Marlins, Single-A Jupiter Hammerheads, High-A Beloit Snappers, and Jacksonville. In 12 appearances for the four affiliates, he compiled an aggregate 0–1 record and 4.11 ERA with 14 strikeouts across 15+1⁄3 innings pitched. Go was released by the Marlins organization on June 17, 2025.
Detroit Tigers
On June 23, 2025, Go signed a minor league contract with the Detroit Tigers. He pitched primarily for the Triple-A Toledo Mud Hens, posting a 1–0 record and 4.29 ERA with 22 strikeouts and three saves in 14 games; Go also made six appearances for the High-A West Michigan Whitecaps, but struggled to a 6.00 ERA with one strikeout over six innings pitched. Go elected free agency following the season on November 6.
On December 16, 2025, Go re-signed with the Tigers organization on a minor league contract. In 2026, he made 27 appearances split between Toledo and the Double-A Erie SeaWolves, posting a cumulative 3–1 record and 1.96 ERA with 54 strikeouts and four saves across 41+1⁄3 innings pitched.
Minnesota Twins
On July 5, 2026, Go was traded to the Minnesota Twins in exchange for cash considerations; two days later, he was selected to the 40–man roster and promoted to the major leagues for the first time. After four appearances, he was sent to the Triple-A St. Paul Saints, where he was ejected prior to his first appearance on July 24, due to umpires finding a foreign substance in his glove. On July 26, Go was ultimately handed a 10-game suspension. On August 2, his suspension was reduced to an eight–match ban. This is the first time in MLB and MLB in the U.S. that penalties for caught illegal pitching have been relaxed. Go made four total appearances for Minnesota, recording a 9.00 ERA with five strikeouts over four innings of work. He was designated for assignment by the Twins on August 28. He cleared waivers and elected free agency on August 30.
As a reliever, Go throws a fastball averaging 94–95 miles per hour (151–153km/h), maxing out at 98 miles per hour (158km/h), and a slider as his primary pitches.
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