Based on the level of respect or formality, you can say "I like sumo" in Korean in 3 ways:

• Informal: na-neun ilbon ssireum-eul joahae (나는 일본 씨름을 좋아해)
• Formal: na-neun ilbon ssireum-eul joahaeyo (나는 일본 씨름을 좋아해요)
• Very formal: jeo-neun ilbon ssireum-eul joahamnida (저는 일본 씨름을 좋아합니다)