恋心

1. Origins, structure, and basic meaning

• Structure: 恋心 (こいごころ) is romantic affection for another person. It appears as a feeling disclosed and a feeling that changes.
• Basic usage: Long-held affection is written in a letter; childhood love gradually becomes friendship.

2. Common pitfalls and similar expressions

• Enduring feeling expressed and feeling transformed into another bond
  • 恋心を marks what is expressed in writing, while 恋心が is the subject undergoing change. In the second example the feeling does not remain unchanged.