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Spoiler!
very late in the story, due to his own stupidity, actually.
So the thing is - he was weakened by smth, and he was advised by the spy of the enemy nation some medicine. It helped in the begining but made him be very reliant on it and this medicine killed him slowly. He was warned many times by crown prince and FL but in the begining he didn't listen, then he didn't care. After he dies, the enemy nation attacks, but ML as an emperor intervenes, saves the situation and takes FL as his wife.
So the thing is - he was weakened by smth, and he was advised by the spy of the enemy nation some medicine. It helped in the begining but made him be very reliant on it and this medicine killed him slowly. He was warned many times by crown prince and FL but in the begining he didn't listen, then he didn't care. After he dies, the enemy nation attacks, but ML as an emperor intervenes, saves the situation and takes FL as his wife.