Later, he moved with his family to settle down on the Thonburi side close to Wat Mai Phiren temple, where he started boxing for the first time in the event organized by the Royal Thai Navy.

The other two fighters that defeated Chionoi during this time, Mitsunori Seki and Akira Oguchi, lost rematches with him.

On September 22, 1962, in Quezon City, Philippines, Chionoi met Primo Famiro for the vacant OPBF Flyweight Championship.

In July of the following year, Chionoi lost his first defense of the OPBF Flyweight Championship in a decision to Tsuyoshi Nakamura in Osaka, Japan.

Burruni had captured his world titles by defeating Chionoi's predecessor, Pone Kingpetch, in April 1965.

[1][2] Chionoi made four successful title defenses during this first reign as champion, including victories over McGowan in their rematch, and Efren Torres.

In March 1970 in front of over 40,000 of his countrymen, Chionoi won a 15-round unanimous decision over Torres in their rubber match, to once again claim the WBC Flyweight Championship.

After losing his third World title, Chionoi won a ten-round decision over Willie Asuncion, then lost by knockout to Rodolfo Francis in August 1975.

Chionoi lived a comfortable life in retirement with his wife of over 45 years, spending as much time as possible with their four children.