2020-present: Joining Alamat, acting, modeling Sebastian auditioned for
Viva Records' new boy band project in 2020. The members underwent intensive training for nine months, which encompassed singing, dancing, physical fitness, and personality development. Their training also included acting workshops. Sebastian was appointed as the leader of the group. In March 2022, Sebastian completed
Viva Artists Agency's Basic Acting Workshop for Film and TV. He made his film debut in the 2022 romantic drama film
Expensive Candy as Leung, one of Toto (
Carlo Aquino)'s troublemaker students. In January 2023, Sebastian starred in the music video for "
Maharani", a single by Alamat. In the video, he and the other members of Alamat are classmates rehearsing a
singkil performance with their classmate, portrayed by
Jhoanna Robles of
Bini. Sebastian is Prince Bantugan and Robles is Princess Gandingan, the main couple of the
Maranao epic poem usually portrayed in
singkil performances,
Darangen (). As they continue to practice the dance, a spark grows between Sebastian and Robles.
Nylon Manila's Rafael Bautista remarked that "it felt correct seeing them as the lead couple of the video", pointing out that Robles and Taneo are both the official leaders of their respective pop groups. In May, Sebastian posed for the Philippine magazine
Parcinq's fashion feature, styled by Bryan Laroza. Hans Ethan Carbonilla wrote that Sebastian's "ethereal sun-kissed glow" perfectly captured the essence of a summer day in the countryside. Sebastian walked the runway at BYS Fashion Week 2023 in October, modeling pieces by Antonina. That year, he also starred as Joey in
Marita. In 2024, Sebastian had a supporting role in the romantic drama film
Ikaw Pa Rin Ang Pipiliin Ko (). On August 15, 2025, he was announced as a cast member on
Ang Mutya ng Section E (), as Yuri's rival Ryosuke Sato. ==Discography==