In Korean, there are several phrases that convey affection and love. If you want to express that you're 'in love' (), a more casual way is to say . This phrase roughly translates to 'my heart is yours.' If you want to be more formal or express deeper feelings, you could say , which means 'you occupy my entire existence.' For a romantic setting, your girlfriend might appreciate saying to you, meaning 'the warmth of the summer' - a lovely and poetic way to describe the feeling of being in love.