What did President Lee say when he received a Xiaomi smartphone as a gift? ... President Xi Jinping burst out laughing = South Korean media

Chinese President Xi Jinping laughed out loud at President Lee Jae-myung's joke after he was given a Xiaomi smartphone as a gift.
Following the APEC (Asia-Pacific Economic Cooperation) summit held in Gyeongju, President Xi held a summit meeting with the leaders of China and South Korea.
On the afternoon of the 1st, President Lee held a friendly event where they introduced the gifts they had prepared for each other. Among the gifts prepared by the Chinese side, President Lee introduced a Xiaomi smartphone using a Korean-made display.
He showed interest in smartphones. At that time, he joked, "Is the communication security properly done?" and laughed. President Xi also laughed and said, "There is a 'backdoor' (security bypass)
President Lee clapped his hands and laughed loudly. President Lee presented President Xi with a Go board made from the finest kaya wood.
The presidential office explained that this was in consideration of the gift of Go stones given to President Xi when he visited South Korea 11 years ago, and that it was meant to express hope that the ties between China and South Korea will continue on the Go board.
A tray crafted using the traditional Korean craft of mother-of-pearl inlay was also presented to President Xi, while Peng Liyuan received cosmetics from a Korean manufacturer and a silver-handled teapot.
In addition to the Xiaomi smartphone, President Xi also received a set of four study aids made of jade (one of the study hobbies of Chinese literati: brush, ink, inkstone, and paper).
The first lady, Kim Hye-kyung, was presented with a teacup set given to her by her first lady, Peng Liyuan. The Korean food that captured Xi's heart was "Hwangnam," a specialty of Gyeongju.
President Lee gave Xi a loaf of Hwangnam bread wrapped in a traditional Korean wrapping cloth to welcome him when he arrived in Korea.
The message also read, "Please enjoy." In response, President Xi reportedly expressed his gratitude to President Lee the day before, saying, "I enjoyed the Hwangnam Bread" when he met with him for the first time.
President Lee sent an additional 200 boxes of Hwangnam Bread to the Chinese delegation and instructed Minister of Foreign Affairs Cho Hyun to give Hwangnam Bread to all APEC delegations, including those from China.
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