public async Task <DifferentUserInfoResponse> GetDifferentUserInfo(Guid userId, Guid differentUserId)
        {
            var differentUser = await _friendshipRepo.GetDifferentUserInfo(differentUserId);

            differentUser.EnsureExists("User not found.");

            var differentUserInfoResponse = _mappingService.CreateDifferentUserInfoResponse(userId, differentUser);

            return(differentUserInfoResponse);
        }