On 29 April 1932, Yun took a bomb disguised as a water bottle to a celebration arranged by the Imperial Japanese Army (IJA) in honor of Emperor Hirohito's birthday at Hongkew Park, Shanghai (one contemporary news report states Yun threw a hand grenade but they also say he was killed at the scene).
The bomb killed the  government minister for Japanese residents in Shanghai, Kawabata Sadaji (河端貞次), and mortally wounded General Yoshinori Shirakawa, who died of his injuries on 26 May 1932.
Among the seriously injured were Lieutenant General Kenkichi Ueda, the commander of the 9th Division of the Imperial Japanese Army, and Mamoru Shigemitsu, Japanese Envoy in Shanghai, who both lost a leg.
The Japanese Consul-General in Shanghai, Kuramatsu Murai (村井倉松), was seriously injured in the head and body.

Yun then tried to kill himself by detonating a second bomb disguised in a bento box.
It did not explode and he was arrested at the scene.
The Illustrated London News reported that:
The Japanese National Anthem was being played, when a youth was seen to step forward and place a cylinder on the front of the dais and then dart backwards.
A dull explosion immediately followed, but it attracted so little attention that the music continued playing. [...]
others were seen to collapse wounded and bleeding, while soldiers seized the youth and battered him.
Subsequently, another bomb of the same pattern was found near the dais unexploded."

After being convicted by a Japanese military court in Shanghai on 25 May, he was transferred to Osaka prison on 18 November.
He was then moved to Kanazawa, Ishikawa: the headquarters of the IJA's 9th Division.
Yun was executed by firing squad on 19 December.
His body was buried in Nodayama cemetery in Kanazawa.

The then-President of the Chinese Republic, Chiang Kai-shek of the Kuomintang government, praised Yun's actions, stating he was "a young Korean patriot who has accomplished something tens of thousands of Chinese soldiers could not do".
However the future South Korean president, Syngman Rhee, disapproved of the incident and Kim Koo's strategy of assassinations as a means to achieve independence because the Japanese could use such attacks to justify their oppression in Korea.
On 29 April 1932, Yun took a bomb disguised as a water bottle to a celebration arranged by the Imperial Japanese Army (IJA) in honor of Emperor Hirohito's birthday at Hongkew Park, Shanghai (one contemporary news report states Yun threw a hand grenade but they also say he was killed at the scene). The bomb killed the  government minister for Japanese residents in Shanghai, Kawabata Sadaji (河端貞次), and mortally wounded General Yoshinori Shirakawa, who died of his injuries on 26 May 1932. Among the seriously injured were Lieutenant General Kenkichi Ueda, the commander of the 9th Division of the Imperial Japanese Army, and Mamoru Shigemitsu, Japanese Envoy in Shanghai, who both lost a leg. The Japanese Consul-General in Shanghai, Kuramatsu Murai (村井倉松), was seriously injured in the head and body.
Yun then tried to kill himself by detonating a second bomb disguised in a bento box. It did not explode and he was arrested at the scene. The Illustrated London News reported that:
The Japanese National Anthem was being played, when a youth was seen to step forward and place a cylinder on the front of the dais and then dart backwards. A dull explosion immediately followed, but it attracted so little attention that the music continued playing. [...] others were seen to collapse wounded and bleeding, while soldiers seized the youth and battered him. Subsequently, another bomb of the same pattern was found near the dais unexploded."
After being convicted by a Japanese military court in Shanghai on 25 May, he was transferred to Osaka prison on 18 November. He was then moved to Kanazawa, Ishikawa: the headquarters of the IJA's 9th Division. Yun was executed by firing squad on 19 December. His body was buried in Nodayama cemetery in Kanazawa.
The then-President of the Chinese Republic, Chiang Kai-shek of the Kuomintang government, praised Yun's actions, stating he was "a young Korean patriot who has accomplished something tens of thousands of Chinese soldiers could not do". However the future South Korean president, Syngman Rhee, disapproved of the incident and Kim Koo's strategy of assassinations as a means to achieve independence because the Japanese could use such attacks to justify their oppression in Korea.
Yun Bong-gil