Indiscriminate friendliness (IF) is a prominent issue with children adopted from China to the United States. Through a mixed methods design, the authors explored four Chinese adoptees’ experiences of IF within their real-life context, investigated potential factors associated with IF, and examined the IF–attachment relationship. This mixed methods study consisted of a qualitative case study of four children adopted from China and a quantitative investigation into IF using a sample of 92 adoptive parents with Chinese adoptees. The qualitative findings revealed crucial propositions related to children’s IF, and the quantitative results provided further evidence to corroborate the qualitative findings. This study reinforced the stance that IF should be treated as a distinct construct from attachment. Researchers and professional counselors can benefit from the results of this study to better serve Chinese adoptive families.