What is the meaning of the ”blue ribbon badge” worn by Prime Minister Kishida during his visit to South Korea?

Prime Minister Fumio Kishida visited South Korea for two days and one night to attend the 9th Japan-China-South Korea Summit. Prime Minister Fumio Kishida attracted attention by wearing a "blue ribbon badge" just like when he visited South Korea in May last year.
According to the South Korean Presidential Office, Prime Minister Fumio Kishida entered the country through Seoul Airport on the afternoon of the 26th. This is his first visit to South Korea in about a year since the Japan-South Korea summit in May last year.
Prime Minister Fumio Kishida met with President Yoon Seok-yeol at the Presidential Office in Yongsan, Seoul, to begin bilateral talks.
Prime Minister Tadashige Fumio was wearing a blue ribbon badge on the left lapel of his suit. This blue ribbon badge symbolizes the issue of Japanese abductees, a long-standing unresolved issue in Japan.
The blue color represents the abduction victims, their families, and Japanese citizens.
The meaning behind this is that they are waiting for a reunion while looking out over the sea between Japan and North Korea. Prime Minister Fumio Kishida, as well as his predecessors Yoshihide Suga and Shinzo Abe, also wear blue ribbons on official occasions.
The South Korean Ministry of Unification also produced three blue forget-me-not badges in January to pray for the safe return of the abduction victims, detainees and prisoners of war, and to publicize the pain of their families.
The flower language of forget-me-nots is "don't forget me." President Yoon Seok-yeol wore a forget-me-not badge at the Cabinet meeting in March. When he met with Prime Minister Fumio Kishida on the same day,
He appeared wearing only a badge bearing the national flag of the country. South Korea and Japan have announced that they will seek China's cooperation in resolving the issue of North Korea's nuclear threat and the abduction of Japanese citizens at the Japan-China-Korea summit to be held on the 27th.
Prime Minister Fumio Kishida met with reporters before leaving Japan for South Korea that day and said, "We will discuss North Korea's nuclear and missile programs and the issue of Japanese abduction victims, and seek closer communication."
President Yoon Seok-yeol also said in his opening remarks that he would like to "work closely with the Prime Minister so that a historic turning point will be created for further progress in Japan-Korea relations next year, which marks the 60th anniversary of the normalization of diplomatic relations between Japan and Korea."
I want us to come together as one and prepare together."