In March 1931, Kim and Lee met in secret. Kim asked Lee about the situation in Japan, and eventually asked if Lee would be willing to return to Japan to assassinate the Emperor. Lee agreed. Kim reportedly then sought out Kim Hong-il, an ethnic Korean who served in the Chinese
National Revolutionary Army and managed weapons for Shanghai. Together, they theorized that the Emperor would be about away from a crowd in public appearances, and that they should use a lighter grenade that could be thrown farther, at the cost of a weaker explosion. Preparation for the attack happened slowly; the KPG was plagued with infighting and poor funding throughout its history. Eventually, by November 1931, Kim managed to acquire everything they needed for the mission. One grenade was acquired from Kim Hong-il. Another grenade, which Lee was to use to commit suicide, was from Chinese military officer
Liu Zhi. The funding ($1,000, worth $ in ) came from Korean Americans. At a KPG meeting on December 6, Kim announced the goal of his mission and asked for approval. KPG leaders such as
Jo So-ang and were reportedly aghast at the plan, and initially rejected it because they found the mission too expensive and unlikely to succeed. But because everything was already prepared, they eventually relented. On December 13, Lee swore an oath to make the attack on the Japanese Emperor, then took a now famous photo with the grenades and his written oath. On December 15, Kim gave Lee the two grenades and taught him how to use them. Lee asked if he could test a grenade to see how large the explosion would be, but Kim declined and assured him it would be large. Kim also told Lee to hide the two grenades near his groin while boarding the ship to Japan. On December 17, Lee departed from Shanghai to
Kobe, and he eventually made his way to Tokyo by December 22. On either December 28 or 29, Lee saw an article in the
Tokyo Asahi Shinbun that said that the Emperor would be present at a public military parade on January 8 in
Yoyogi Park. He decided that that would be the day for the attack. In early January, he sent a telegram to the anxiously waiting Kim with the date. Lee set about preparing for the attack. Following instructions from Kim, he modified the grenades so that the pin wouldn't need to be pulled out in order to have the grenade detonate; this would make for a quicker attack. On January 6, he toured the parade venue in advance. He realized that the venue was so large that he wouldn't be able to get close enough for the attack. He changed plans, and decided to attack from the road, when the Emperor was moving. Around this time, he obtained the business card of a military police officer, which later proved crucial to the attack. == Assassination attempt ==