It is said that Jakko lost the opportunity to return home, due to the destruction of Koguryo by the allied forces of the Tang Dynasty and Shiragi (an ancient Korean kingdom) in the year 668.
668年（天智7年）、唐と新羅の連合軍に高句麗が滅ぼされたため、若光は帰国の機会を失ったいう。