Writing a letter to friend in Chinese language

Qīn'ài de Dōng Dōng:
亲爱的冬冬:
Dear Dongdong:
Chinese language notes for Chinese language students to prepare HSK syllabus according to HSK standard course textbooks
Lesson 1 爱的细节 Details of Love ài de xìjié 爱的细节 Details of love